Tony Horton is about to "annihilate" your fitness excuses. And he's using 30 minutes to do it. That's right: P90X3 has arrived. Like its popular predecessors, the third installment in Horton's P90X ...

See the rest of Slate’s Fitness Issue. It’s late on a cold night, and I am holding two large Italian-style tomato cans and vigorously swinging my arms in forward and backward circles. One arm comes up ...

Vice presidential candidate Paul Ryan credits P90X, an intense 90-day home workout routine, for his ripped abs and lean build. So do Hollywood heavyweights like Ben Stiller, Ashton Kutcher and Demi ...