Need a quick workout on the go? Download Yogify, a free app for the iPhone or iPad produced by EA Sports. It comes with five sample classes ranging from 15 to 45 minutes long, beginner to advanced level—plus the option to purchase up to 40 additional classes. Although it's not the same as having a live teacher in the room, the program makes everything super clear. Before you even start the video, you can preview the series of poses with a step-by-step list of pictures (including tips on how to perform each correctly). Best of all? You can set your personal playlist behind the teacher's voice so you're moving to your own music.