P90X is a set of 12 high-intensity online workouts that you do over the course of 90 days. You've probably seen the infomercials about it on TV. You'll commit to working out 6-7 days per week, for 1-1 ...

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Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? When I first started running seriously, I thought I had to be out of breath ...