Xbox Fitness

31 Achievements

1,825

335-472h

Xbox One

100 Card Club

Completed your 100th Stamp Card.

100

0.02%

How to unlock the 100 Card Club achievement in Xbox Fitness - Definitive Guide

DJ KOOLAIDE

TrueAchievements

19 Nov 2014 00:11

Use the Gatorade Sports Performance: Football Training Camp-Recovery. You will need to get the first challenge to be at 8/9. to do this keep playing until you score a point. Then you can quit. This will count as 1 of the 9. Once at 8/9 you will want to quit as soon as the game allows which is at 33 seconds. You will hit start then quit. You will receive 4 stamps for every time you do this. just reload the training and repeat quitting out at 33 seconds.
Estimated time is 3 hrs to get from 50 to 100.

19 Nov 2014 00:11

118 Comments

So i want to score a point then quit until i get it to 8/9. After that start it up and quit at 33 seconds which i should receive 4 stamps and be able to do it again ?

By WAR Psyco on 19 Nov 2014 02:31

yes you can keep getting 4 stamps each time you do it

By DJ KOOLAIDE on 19 Nov 2014 02:32

quit is the furthest left button after you pause the game

By DJ KOOLAIDE on 19 Nov 2014 02:33

after doing this for a bit last night all I could think of was this:

http://www.youtube.com/watch?v=r_2HMMmgP4w

By Nuckinn on 19 Nov 2014 17:08

Can confirm this works just got to stamp card 100. 11/19/14

By WAR Psyco on 19 Nov 2014 19:50

If this has been patched I suggest you update the solution.

By n1ckKz on 18 Mar 2015 19:37

Today just finished again level 100 card and I was more thas suprised when saw that my new level is 101 "Flawless Champion II".

Tried the Recovery solution and still works fine!

By Renattooo on 06 Aug 2015 08:06

I can confirm that the first challenge, Recover Routine, still gives 4 stamps each time you quit. Note that there is no notification that you have received the stamps. But, if you check your profile in the upper right of the home page, you will see the stamps on your card increasing.

By Noel The Cat on 15 Mar 2017 06:35

Yeah my 100th card achievement is stuck on 93% I even filled the level 100 card 10 times. Lets hope it will eventually unlock.

By DeathGuard 123 on 19 Nov 2014 23:15

Ok got the Gatorade recovery to 8/9 but when I quit it just goes back to main title screen and no stamps, any ideas?

By BadgerFarts on 08 Feb 2015 13:51

Glitched for me as well. Stuck at 99%.

By D0CT0RJay on 19 Mar 2015 01:10

It hasn't changed for me, still for doing 9 workouts and I tested it today and still works

Are you sure you are on the right recovery session and haven't completed it by accident?

By TangerineGamer on 18 Apr 2015 13:29

Stange... yea pretty sure. It stopped working for me the other day when Xbox Live was fucking up. Maybe I quit but the website didn't register that I did and counted it as complete.

That sucks.

By Cerberus XII on 20 Apr 2015 02:30

Does this work for any other workout... I have 43 cards legit, so don't have much to choose from I haven't done...

By SMOKE U FOOLS on 09 Jul 2016 14:50

I already used that one 'legit' but if you need, you can also use the Beachbody 'Insanity' workout. Its 2 stamps and 26 seconds of motivation before you can quit.

Incidentally, stamps are awarded for completing 2 workouts... so fudge 1 and then quit the others as fast as possible for the free stamps.

By planting42 on 19 Nov 2014 20:06

Completed the 100th card, but the achievement didn't unlock. anyone else having this problem? All of the other 4 achievements in the title update unlocked fine.

By TrapMuzik99 on 19 Nov 2014 21:28

EDIT: It just popped when I was sitting at the dashboard.

By TrapMuzik99 on 19 Nov 2014 21:55

I'm having the same issue. Might be residual from the Azure Server errors from last night, as I've noticed the game will eventually sync up at random points. Could just need to do that.

By Geoffistopheles on 19 Nov 2014 22:46

Mine isn't unlocking at all I have 64 stamp cards done, no achievement and it says 0% wtf

By Strategy One on 19 Nov 2014 23:14

I got to 71 cards and then it completed the challenge , and when I used planting42 's workout it completed right away too am I doing something wrong, and are there other workouts?

By Zoomt1 on 19 Nov 2014 23:41

71 cards done no achievements I feel like im wasting my fucking time

By Strategy One on 20 Nov 2014 00:29

It unlocked while the xbox was off like 10 hours after I've met the requirements. With the timestamp when it should have unlocked, so I tried 40 minuts extra for nothing lol. So if any one else has this problem, as long as you complete the 100th card it should eventually unlock, no need to try extra.

By DeathGuard 123 on 20 Nov 2014 11:51

Those extra 40 minutes might be worthwhile regardless. XB Fitness is only guaranteed free with Live until Jan next year so if there's another update with achievements those extra cards might be useful.

By MisterGuyMan on 20 Nov 2014 17:52

Extra cards? When this popped it reset my progress on the 100th card. Has anyone gotten above 100?

By planting42 on 20 Nov 2014 18:09

Can anyone post another workout that is good to boost on? I have already completed this challenge boosting another achievement. I need a good challenge that pays out 4 stamps in 30 seconds.

By Arsenic 17 on 20 Nov 2014 18:16

I am using Tracy Anderson Transform I Muscular Structure I since somehow the Gatorade one completed on me. This one is 2 stamps quitting after 11 seconds. Of course you first need to be 1/2 workouts done.

By LausDomini on 21 Nov 2014 02:00

yes,can anyone post another one?

By EDOARDO1 on 21 Nov 2014 11:06

I am using Jillian Michaels Killer Buns & Thighs Level 1, it has 3 stamps and 24 sec intro. But like most of the other workouts, you have to complete it 3 or 4 times before getting this challenge.

By Mick Wazowski on 21 Nov 2014 12:35

It's not a problem, thank you Michael!

By EDOARDO1 on 21 Nov 2014 16:41

You're welcome :)

By Mick Wazowski on 22 Nov 2014 10:33

For me the challenges tend to complete for some reason after doing this method a card or two. Anyone else have this problem?

By janiwesterling on 22 Nov 2014 21:10

@Janiwesterling I have the same problem

By Zoomt1 on 22 Nov 2014 21:44

you have to make sure you hit pause ASAP otherwise it will count your progress. happened to me twice when i wasnt paying attention.

By jacky rooster on 22 Nov 2014 21:50

Note: If you delete the savegame from local and cloud you start from stamp number one. But challanges dont resets! Its weird!

So...
Any way For delete challanges progress?

By EDOARDO1 on 23 Nov 2014 16:09

i get 0 stamps doing exactly what it says on this and the tracy workout...

By Tankk OG on 24 Nov 2014 16:27

Can I use this to go from 0 stamps to 100?

By nath92977 on 30 Nov 2014 22:33

yes

By DJ KOOLAIDE on 01 Dec 2014 01:11

To anyone having issues, I would make sure you are hitting pause within 33-36 seconds and have your Kinect facing towards a wall.. After hitting pause, go to the left two spaces (to the button that looks like an eject button) and hit

. Confirm you want to Quit the Workout, not Skip to the End. If you go to the right you will skip to the end and the workout will complete.

Also I was cooking and lost track of time. I have my Kinect facing towards a wall so it didn't track but I paused the game and did a Hardboot of my XBox (hold down power button for 10 seconds). After booting backup, the workout wasn't complete and I kept on as normal. I'm not saying this will work 100% of the time but it did for me.

By dc0dr on 04 Dec 2014 15:16

I'm on Card number 15 and it's killing me already lol I worked out I need to do this 33 seconds then quit 382 more times to get to card 100 this is brutal.

By Conor x420a on 21 Dec 2014 11:14

For those who have screwed up like I did and accidentally completed the 9th workout. These are two to consider as alternatives from the comments above (largely similar stamps per time spend in video but less efficient due to the menu screen and restarting).

"I am using Jillian Michaels Killer Buns & Thighs Level 1, it has 3 stamps and 24 sec intro. "

"I am using Tracy Anderson Transform I Muscular Structure I since somehow the Gatorade one completed on me. This one is 2 stamps quitting after 11 seconds."

By S P 4 C E Y on 22 Dec 2014 13:42

My goodness, JJ Watt is going to be filled with protein for the next 30 years before I'm done with this.

By AHGreg on 14 Jan 2015 19:02

I couldn't seem to get this to work. I read through all the comments and I'm not sure if I'm missing something. I'm on 8/9 and I quit right at 33 seconds. Any ideas?

By LeviAJones on 20 Jan 2015 18:08

If it still says 8/9 then every time you quit you should be obtaining 4 stamps

By DJ KOOLAIDE on 20 Jan 2015 18:10

Weird. It just takes me out to the main menu and nothing happens.

By LeviAJones on 21 Jan 2015 16:03

if you completed the challenge accidentally there is a work around, but you will have to start from scratch, in the main menu press the start button( or the three lines button...), configurations and delete cloud saves, your challenges will be reset, and your level too. i thinks this came up with the latest title update, but don't quote me on that. good luck

By MLP Thomaz on 21 Jan 2015 17:48

This still works! Seems to only work before the 40 sec mark though. Did one at 40 sec and it did not work. The rest were 34-37 seconds, and it registered 4 stamps each time!
Thanks for the guide! +1 thumbs up!

By EnbukanSquirrel on 22 Jan 2015 01:43

Epic! It worked!! Just unlocked the 10th stamp card XD

I'm at 8/9 following the solution perfectly after scoring points in a couple of rounds. Got Kinect covered up with a picture frame and hammering the pause button when it approaches 33secs. Thank you so much for this. I thought this would be a lost cause after they patched an old method to get to 50!

Best start getting this done! One heck of a grind mind. Xbox Music will come in handy as I don't know how many times I can handle that bs speech & promotion of crap products.

By AG Bucky Barnes on 22 Jan 2015 05:53

You sir, deserve one mean handjob for this! Thanks!

By ATCS on 25 Jan 2015 19:55

Got it to 13 but somehow after 45sec when it started it did make no points but it says i did the workout when my kinect facing the wall. Do you know what other workout does this method?Letting you know make sure pause in between 33-37 sec mark.

By BlueyZeal on 01 Feb 2015 20:45

By BlueyZeal on 02 Feb 2015 09:25

i accidentally screwed up the Gatorade one, and i guess only one of the gatorade challenges works because if you get any other challenge to 8/9 on jj watt it doesn't work.
now im completely screwed at level 85 because all of the other work outs that you can do this with cost money.

By PolisRanger2033 on 06 Feb 2015 06:46

you can completely delete the game and the challenges will reset, BUT you will also be back to card 1

By DJ KOOLAIDE on 06 Feb 2015 09:16

What is the method for the jillian michaels one? what is the challenge called? its only 10$, so i guess i will just buy that.

By PolisRanger2033 on 06 Feb 2015 17:15

By PolisRanger2033 on 06 Feb 2015 20:15

Same for me, BadgerFarts. If anyone has any ideas, I would love to find a way to get this to work.

By LeviAJones on 13 Feb 2015 19:41

Finshed card 100 several times yesterday, but still nothing. Any idea?

By Renattooo on 16 Feb 2015 08:20

Finshed card 100 several times yesterday, but still nothing. Any idea?

By Renattooo on 16 Feb 2015 09:09

Adanedar had the same issue as you.

By kingrich06 on 18 Feb 2015 02:37

Hi Adanedar! Yes, exactly! Have to finish the 50th-60th-70th... so got all achievements on 51-61-71..., except 91 as you wrote, just popped after finished the 91th card, so on 92. I think we lost a level there and so we should finish 101 to catch it, but there are no more levels after 100, so it's impossible right now. :( I talked with support chat 3 times, cleaned cache with hard reboot, deleted persistent storage, deleted and redownload profile, deleted save game from console, reinstall game, but still nothing. I would like to try delete my save from cloud as well to start over, but as I see you did it and won't help. I will try support again and I'll let You know If our problem has resolved. ;) ps: we don't need more stamps, we need just ONE achievement!

By Renattooo on 19 Feb 2015 09:22

OK, so looking at this thread Fit Points Reset there was an update recently, is it possible that this has caused the glitch?
By the sound of it the ability to get infinite stars is still working though

The reason I ask is that the first comment saying there was an issue by PolisRanger2033 is at the same time of the start of the forum thread

Also so what would be the legitimate way to get the achievement?

By TangerineGamer on 19 Feb 2015 17:04

I screwed up an let it go to long, is there any other challenges this works with?

By NuttySandman123 on 22 Feb 2015 19:29

any updates on whether this works? i tried from level 1 and nothing happened. 23/2/15

By ChameleonNinjaX on 23 Feb 2015 17:15

Tanger?

By ChameleonNinjaX on 25 Feb 2015 20:53

Anyone tried getting 100% and no more of 100th. fill all 18 slots, does it unlock then?

By ChameleonNinjaX on 26 Feb 2015 07:21

On my 3rd attempt on chat support they told me that forwarded my problem to a specialist, who will figure out what's going on and resolve it. :) They will call me or send an email when got something....

By Renattooo on 02 Mar 2015 15:17

Probably not the best time to go for this achievement then. Darn. Procrastination wins again!

By Mr Granstaff on 03 Mar 2015 01:15

There was just a title update, does this still work?

By Mrsod on 04 Mar 2015 00:33

The trick still works for me, but the achievement still not. :(

By Renattooo on 04 Mar 2015 13:12

I cant get the trick to work on the Gatorade recovery an I don't really want to purchase additional content to do it, if I delete my cloud save will it reset my progress towards the mount Everest achievement?

By BadgerFarts on 06 Mar 2015 12:54

G Harris93, today I tried to get it by filling the 100th card exactly, no overflow. It just showed my 100th card completely empty, still no achievement.

By Wendalina Mona on 17 Mar 2015 22:22

it still works apparently the achievement is glitched at the moment

By DJ KOOLAIDE on 18 Mar 2015 19:55

I honestly don't know. Probably needs a patch

By DJ KOOLAIDE on 18 Mar 2015 22:11

Mine glitched the first time through before clearing my cache. I then tried to reset my progress and go through again but still no luck.

By D0CT0RJay on 20 Mar 2015 20:53

New update, but nothing changed. Gatorade still works....

By Renattooo on 24 Mar 2015 11:02

anyone tried, deleting save, and just getting the first stamp card completed 99% - 100%, or does this reset the achivement

By ChameleonNinjaX on 24 Mar 2015 13:00

So can I use this solution or is this achievement actually glitched? Don't want to start the game if it is.

By on 26 Mar 2015 05:39

If the solution still works I would love to know how, I play the recovery, score a point, quit. I do this until its at 8/9. Then start quitting at 33 seconds (kinect camera covered) and it just takes me to the title screen. Am I missing something? Doing something wrong?

By BadgerFarts on 26 Mar 2015 08:27

And you got 4 points. Just check with the "start" or what button.

By Renattooo on 26 Mar 2015 17:52

Dude your a legend, I didn't realise it just added them on. Many thanks

By BadgerFarts on 26 Mar 2015 20:55

Its still glitched. I tried it today.

By PRELUDEcris on 28 Mar 2015 02:44

April 6th update, anyone able to get 100

By ChameleonNinjaX on 06 Apr 2015 02:39

success in progress unlock....

By speedline21 on 08 Apr 2015 05:31

Same here: 100% Done! Unlocking... but still not finished. :O

The gatorade trick still fine!

By Renattooo on 08 Apr 2015 14:06

I keep looking at the Recent Winners list myself.

Keeping my fingers crossed for you all.

By Mr Granstaff on 08 Apr 2015 14:15

@Dylan XBA I hope so! I do a training each morning so we will see... maybe tomorrow, with - finally - a great morning! :)

By Renattooo on 08 Apr 2015 17:10

succes ok!

By speedline21 on 08 Apr 2015 18:28

Holy crap! I know what I'm doing today!

I take it the Stamp Card exploit still works?

By Mr Granstaff on 08 Apr 2015 18:30

finally unlocked

By SWEDENDUDE on 08 Apr 2015 19:30

@renattooo it will unlock for you man, I've had to wait a week for some halo achievements to unlock when said 'done unlocking' so don't worry

By jacky rooster on 08 Apr 2015 20:11

Yeeeeeeaahh! 1600/1600 GS now! :)

@ jacky rooster Last week 1 achievement popped while played Fruit Ninja Kinect 2. "Complete 15 executions in a single multiplayer game" WTF?! Executions in Fruit ninja?! Checked the achievements and it's from RYSE! I played that game last on 12.11.2014. Haha. Bit delay...

Gatorade trick still works! Good luck!

By Renattooo on 08 Apr 2015 20:32

Time to start this bad boy then ...

By TangerineGamer on 08 Apr 2015 22:00

This solution no longer works. They've replace the first challenge.

By Cerberus XII on 18 Apr 2015 03:08

Also confirming that if your previous achievement glitched a level later; this one just popped for me exactly when I completed the 100 card. So no longer glitchy.

By angelsk on 15 Sep 2015 08:19

Still works as of 11/29/15

By anthonyd46 on 29 Nov 2015 16:48

I advise against deleting your save files if your challenge advances. I did that and lost all stamps, but the challenge wouldn't reset.

By TriRock on 03 Dec 2015 21:20

Thanks for this Brother, works a charm! But WOW what a grind this is ...... Wish it was 2 females rather then those blokes that I had to stare at for hours on end

By Doberkiin on 24 Dec 2015 18:38

Still works as of today, no problems. Thanks for the solution.

By MAIZCORN on 10 Jan 2016 01:36

Still works. Made a nice cronus max script to automate this.

By Salsbar on 04 Apr 2016 19:29

Can you go above level 100. Because I just unlocked the level 80 achievement at level 82. So i guess i'll need to go to 102 , hopefully you can go that high

By Grant086 on 30 May 2016 04:06

Yes you can go above 100 now

By angelsk on 30 May 2016 07:00

Yes i also notice that the achievement progress when using the solution. at my 25th stamp, the 50th stamp achievement is under 50% so probably they adjust a bit now and hopefully if we can go above 100 then it shouldn't be glitched for the achievement.

By lfcjohn on 31 May 2016 04:12

Anyone tried this recently. Didn't work for me today bit I intend to do legit anyway so would be good to know incase I run out of time...

By bigfatwallet on 28 Jun 2016 17:22

I would love to know if this still works, too

By alladaskill17 on 28 Jun 2016 20:56

yes this still works

By DJ KOOLAIDE on 28 Jun 2016 22:19

Yes it does but most have one or two stamps instead of four.

By Watty8883 on 19 Jul 2016 13:07

could someone please elaborate a little bit more? i am having a little bit of trouble understanding what he means in 8/9 or something like that.
some screenies would be greatly appreciated

By Idan345 on 20 Jul 2016 21:30

I just set up a 6 stamp glitch on Knockout Body Kickbox Cross Train. I've got the last two Complete X workout challenges to complete at the same time and I can get 6 stamps per minute. This is faster than the recovery workout, I believe, but took about an hour or so to set up.

By Xtowers on 18 Aug 2016 17:12

That seems impossible to me because the first complete x workouts is for 4 session and the last is for 5 sessions.
And the complete 4 session workout challenge unlocks before the 5 session challenge one. So how can u manage to get them to complete at the same time? I'm still using this workout to do this but I can't get the 2 challenges to complete at the same time, I'm just doing it with the complete 4 sessions challenge, which is only 3 stamps

By SHOTOKANKATANA on 27 Aug 2016 09:37

You have to set it up so you complete 1 workout on the 5 workout one just as you complete the challenge right before the 4 workout challenge.

By Xtowers on 27 Aug 2016 12:29

I must have done something wrong, my 4 workout one is at 3 out of 4 and the 5 one is still locked... Ah well, it'll take a bit longer this way but it still works

By SHOTOKANKATANA on 28 Aug 2016 06:13

For those that mess up a challenge and want to start from scratch, you need to delete your cloud data from IN GAME, NOT THE DASHBOARD. The dashboard will reset stamps to zero, but won't reset your challenges.

Go to menu in top right, then settings, then delete cloud data under privacy settings section.

By Palesius on 03 Sep 2016 19:36

.^^^^^^^ GIVE HIM A THUMB UP^^^^^^^.

By on 03 Sep 2016 19:39

.^^^^^^^ GIVE HIM A THUMB UP^^^^^^^.

By on 03 Sep 2016 20:10

For anyone still trying to complete this before the free workouts dissapear (which I believe is Dec. 15th) and you've already completed the Gatorade workout, you can use the Mobility and Strength Training - Core. There is a "Core-tastic! Complete 3 Workouts" challenge for it as well. I don't think it's one of the first ones available but if you complete a couple other challenges first it will pop up. You only get 2 stars from it instead of 4 but the wait time before you can quit out is only 15 seconds instead of 33 seconds so it winds up being about the same time you will spend to get to 100 cards.

Also, you don't have to actually complete the full 30 minutes of the workout for the first 2 points in the challenge. I just skipped to the last minute of the workout and let it play out and it gave me a point each time.

By ICE Faux Pirate on 16 Nov 2016 16:09

Hey for anyone who wants to do this still I just asked my brother to check and he still has access to the Gatorade workouts! I didn't check myself because I have been running Mossa Groove for a week and it hasn't kicked me out! When my brother checked he did not have access to Mossa Groove so it's possible if you get onto and set up your stamps asap and leave it running it hopefully won't stop it when it becomes unavailable. It should have been the 15th but who knows. As far as I can tell Mossa Groove is not available unless you actually paid for it before July 2016, I did not but it is still going. Obviously not gonna help if you didn't already have it running since before the 15th but you may be able to get your stamps done with the Gatorade JJ Watt Recovery Workout. If you get your stamps done you still have 6months to finish the rest with the zombie workout! It's not much but it's an idea if you wanna get as much as you can.

If you want to do peak performance with the zombies workout check Medrus' solution on that to do it manually. You also may be able to do peak performance another way, if you read through the comments for the top Peak Performance solution there is a method explained that uses a broom you push up with a dummy to simulate a jump giving around 1% of peak performance every 30 minutes. I think I would just do it myself to get some exercise if it came to that lol but still it's a lot of jumping.

After 8 days of Mossa Groove I only got 30% towards peak performance (And having done every other achievement). I finally figured it out so now am getting 12-15% every 24hrs. Fingers crossed I don't get kicked out in the next few days. Anyway if you are able to use Mossa Groove or another suitable workout and want to know how I've set it up let me know.

I think for most people though this game is over I just wanted to let anyone know what seems to still be working. My brother sent me a pic of his available workouts and The gatorade with JJ watt set of workouts was still there. No Mossa or 10min solutions though they are all gone!

It's the 19th of December 7pm now so if you can get on it!

By JayD101 on 19 Dec 2016 08:08

Process is still working as said. Sad this is how I need to finish this app

By DoPeY5007 on 06 Jan 2017 06:30

I just posted about a way to get 7 stamps per cycle. Be careful to keep the Kinect off until you're ready. Or if you don't have a Kinect, this allows you to get 3 stamps per cycle.

By MathGuy42 on 22 Jan 2017 22:52

I'm confused about all this. The challenge you need to do is locked and it looks like it's the last one, not the first. Do I need to unlock all the other challenges first before I can use the method talked about here ?

By Cyelwin on 27 Feb 2017 07:12

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Necrophage33

XboxAchievements

All of the Stamp Card achievements are unlocked by completing stamp cards by earning enough stamps to fill all of the spots on each card. Initially the cards require fewer stamps to complete, but once stamp card 10 is reached, all stamp cards require 18 stamps to complete. The main ways to earn stamps are by completing session challenges and beating drill challenges. However, earning stamps this way will take you literally hundreds of hours to reach the 101st drill card and unlock all of these achievements. Thankfully, there is a glitch that can be exploited, which allows you to get 4 stamps every 45 seconds or so. Follow this link here: Stamp Glitch

Since English isn't that user's first language and it may be a little difficult to understand what to do, here is a very concise summary of what to do:

The workout routine you're going to be doing this on is the Recovery session in the Football Training Camp. If you've already completed all of the session challenges in this workout routine, other options are available (see Stamp Glitch hyperlink).
What you're going to be doing is farming the 4-stamp reward for the session challenge to complete the workout routine, which requires you to do the Recovery workout 9 times. Here's how you're going to do that...
Play the Recovery routine in the Football Training Camp and complete the first drill sequence, then quit out. (This should put the session challenge at 1/9 complete)
Play the Recovery routine 7 more times. Each time, play just enough to start getting some fitness points, then quit out. (This should put the session challenge at 8/9 complete)
Here's the important part where you farm stamps - start the Recovery workout routine, and as soon as you're able to pause and quit (around 33 seconds in after the intro ends), quit out of the routine, making sure you don't get any fitness points. This will give you the 4 stamps for completing the session challenge but will leave the session challenge at 8/9 complete.
Rinse and repeat, but it is critical that you don't accidentally get any fitness points! In fact it's safest to do this while being off to the side (not in front of your Kinect) to avoid accidentally getting fitness points if you get distracted and forget to quit. Getting fitness points will officially complete the challenge and you won't be able to farm stamps from that challenge anymore.

This can theoretically be done on any routine with a "Complete X workouts" challenge, but naturally you'll want to choose a routine with the shortest intro possible so you aren't wasting time listening to the long intro every time.

Once you reach the 101st stamp card (complete the 100th stamp card), you'll finally be done unlocking these achievements.