Ashton Kutcher's "Killer" Body Comes From Use Of P90X Looks like I am (30 days in) not the only one using P90X , so is Ashton Kutcher. And let me be the first to let you know that it works as long as you are dedicated to the system you will see results. In case you're wondering what Ashton works out to at home, it's the P90X system, which also counts Pink as a fan. The P90X system is a series of 12 targeted workouts (including yoga, circuit training, and plyometrics) and a nutrition program that promises to transform your body in three months. Ashton's wife, Demi Moore, first started tweeting that the couple were using P90X last year though she had only done the yoga component of the workout series. It looks like the idea of filming Killers was big motivation for Ashton to get in shape. Shortly after getting his P90X system he tweeted, "stepping up the work outs to 2 a days. time to get serious. I'm so paranoid about doing scenes with my sh