Why do racket sports cause stiffness?

Question: I love tennis, but every time I find it harder to practice it because the next day everything hurts. They are not stiff, but rather muscle aches in the joints. Why does it only happen to me with racket sports? Alonso (Jacksonville).

Answer: When we play tennis or paddle tennis, our knees suffer from the continuous flexing movements we make to hit the lowest balls. In this class of exercises we also force the quadriceps and the muscles of the thighs, for example when braking when we are running to hit the ball. In addition, the overload on knees and thighs multiplies when the playing surface is hard, since the body, instead of slipping, brakes sharply.

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