Learn more about the power of rest

Muscle pain after workout is supposed to clear on rest days. You took the day off, skipped a session - and by Wednesday you're more wrecked than before. The problem isn't how hard you're training. It's what happens during the eight hours when your body is supposed to fix it.

You slept 8 hours. The math adds up. But your body didn't get the memo. The problem isn't how long you sleep - it's how much of that time is actually spent in deep sleep, the stage where your body repairs itself. Most people are getting far less than they think. Here's what's happening while you're unconscious and why your sleep surface has more to do with it than your schedule.