Zumba Fitness

Planting42 is correct. Don't Stop is the fastest song. I just want to add a few things. There really is no online community for this game at all times so you're going to want to have a partner to do this with or set up session on TA and facebook. Zumba Kinect 100! is a great group to join on facebook for all the online achievements. People coordinate classes and routines so you'll be able to get this done fast and dance with some different gamertags. Once you have joined and completed 10 online routines, this achievement will pop. You could do this achievement in a half an hour if you do Don't Stop 10 times.

This will take you quite some time to do without boosting as there is no one playing this game. To boost, simply have your dance buddies create lobbies for single routines and choose any song. Don't Stop is the shortest song if you are looking to do it as fast as possible. You don't have to actually dance as you can't fail out. I'd recommend at least scoring something just to be sure it counts. Wiggle a little as it's about to end as you loose score by not copying the instructor.