P90X was an infomercial workout sensation in the mid-aughts. How does it hold up today?

For three easy payments of $39.95, it offered twelve different exercise videos, a nutrition plan, supplement advice and a ...
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Are You Changing Exercises Too Often?

Here’s how to create a workout program that gets you results AND keeps you from getting bored. Have you heard of “muscle confusion”? There are a few popular training programs built around this concept ...
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Paul Ryan's Killer Workout: Is P90X for You?

WAUKESHA, WI - AUGUST 12: Republican vice presidential candidate and Wisconsin native Rep. Paul Ryan (R-WI) greets supporters during a campaign event at the Waukesha Expo Center on August 12, 2012 in ...

When does exercise stop making you stronger—and start causing damage?

Scientists are uncovering the biological tipping point between building muscle and rhabdomyolysis, a rare but potentially life-threatening form of muscle breakdown.