Everyone should be briefed on muscle 101--here's a great overview. Know how your body works so you can work your body!
My favorite fact (especially as a spin instructor who loves that burn-so-good feeling):
For decades scientists thought the burning sensation was a result of your body's producing lactic acid to slow you down when you're going too hard. Seemed logical, until last year, when researchers at the University of California, Berkeley discovered the real reason your muscles burn. Turns out that although the burning is caused by lactic acid, it's not your body putting the breaks on your workout.
The acid actually is a main source of fuel for your muscles. When you push yourself, your muscles convert glucose from food into lactic acid, which is moved via proteins to the mitochondria, your muscles' energy factories. The more you work out, the more efficiently your body uses lactate as fuel — which means you can go longer and harder. Love the burn.
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