Why do you say that playing football will deform your legs?

kicking the ball will only make the legs O-shaped, because the frequency of using the inner instep is very high, and the knees are distorted outward when using the inner instep. After a long time, it is easy to make the legs O-shaped. On the contrary, playing basketball will make the legs X-shaped, and when the body's center of gravity sinks, the knees will bend inward and the legs will be X-shaped, which will stabilize the center of gravity and facilitate faster start.