Theoretically, squats are mainly leg muscles, especially quadriceps femoris on thighs. The calf is not obvious, but it plays an auxiliary role. After practicing for a long time, the thighs will obviously thicken. In particular, if you practice explosive force and challenge heavy weight, your legs will be thick and your weight will be poor. In addition, load-bearing is harmful to knee joint, back and cervical vertebra. It is recommended to wear a towel around your neck, waist pads and knee pads, do not easily challenge heavy weights, and practice since childhood.