罗伯·史密斯博士,心理学家当你锻炼的时候,身体会释放脑内啡。它像一种天然吗啡,被输送贯穿全身,帮助你放松。

• And when you exercise, your body is releasing endorphins. And that's something that's like a natural morphine like substance that pumps through your body, and that helps to relax you.