Because when the muscles on one side of the thigh are over-developed or tense relative to the muscles on the other side, when doing knee bending (squatting, pushing, etc.). ), the stress on the knee joint will be unbalanced, which will lead to the instability of the body, resulting in the phenomenon of thigh trembling.
If you want to improve, you should relax the relatively tense muscles in your thighs and train the weak muscles.
Most people are nervous on the outside of their thighs and weak on the inside. Personally, I think it is mostly related to the details of the outer eight digits of the foot during leg training, so I suggest that the toes should rush forward during leg training, not the outer eight digits.
Secondly, it may be caused by insufficient stability of toes and ankles.
Because squats or other leg movements are not only done by thigh muscles alone, the human body is a precise instrument, and the flexibility and stability of toes and ankles are not enough, which may lead to the instability of the body during squats, which may lead to thigh trembling.
Before leg training, you can move your knees and ankles, slightly stretch (press) your calves and toes, and then massage to relax the muscles in the front of your calves and thighs.