能量来了，感觉不错。
学习速度加快。。。
You're going to change your body and by changing your body you're going to feel better,
you're going to have more energy. And when you have more energy, when you feel
better, you learn faster. There's a lot of research about this. And it shows that people
who have more energy, who are feeling good emotionally, learn faster. People who are
tired and bored learn much more slowly.