At this point, you've probably heard about Tony Horton's monstrous gut-busting P90x workout. If not, check this out:
If you've got the space and the [very minimal] equipment, you can get lean, ripped, and in shape*. To accompany the DVD set, Beachbody has now dropped the official P90x app into Google Play, which will help you keep track of your progress, weight loss, sets, reps, workout schedule, and more. Early reviews of the app are appearing to be positive for the most part, which is always a good sign for an app like this – it's so easy for companies to just throw something together to get it into the Store.