Your heart beats faster. You breathe more rapidly and deeply. And you sweat. Well, that’s probably because you’ve been moving the large muscles in your legs, arms and hips over a sustained period of time. When these major muscles are…


Your heart beats faster. You breathe more rapidly and deeply. And you sweat. Well, that’s probably because you’ve been moving the large muscles in your legs, arms and hips over a sustained period of time. When these major muscles are…