If it works in your living room, wouldn’t it work even better in a class with an instructor and blaring music? That’s the idea behind P90X Live, which piggybacks on the fame of the popular P90X DVD ...

The P90X workout is an incredibly popular home-based, boot camp-style video exercise program that some fitness fanatics swear by. But does it do the job? A study of the system finds it does improve ...

Xbox Fitness users can now buy a monthlong P90X workout program for $59.99, publisher Microsoft Studios announced today. Released today, P90X for Xbox Fitness is a 30-day version of Tony Horton's P90X ...

On Monday's SI Now, creator of P90X Tony Horton discusses his new workout video P90X3, what makes the third version different from the earlier two, and some of On Monday's SI Now, creator of P90X Tony ...