According to a German professor, the soreness comes from straining your muscles in an uncommon way. For example, jumping onabicycle for a ride, because you haven't ridden in a long time.
Why ride hundreds of miles onabicycle when you can drive in a car, or better yet fly in a plane?
既然你可以驾车，或者更好一点，坐飞机，为什么还要骑几百英里的自行车？
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According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping onabicycle for a ride, because you haven't ridden in a long time.