Get Fit With Mel B

Easy: When you do your first Workout (no matter if Fitness or Aerobic) try to do well (80% Overall should be good enough).

After the Workout you will be asked if it was to easy / just right / to hard. Pick "to easy" and you will start at Fitness Level 75 - Achievement unlocked

PS: do this on all Workout Types to make your loooooong way to 100% much shorter...