For human strength, leg strength plays a decisive role. Whether it is weightlifting, weightlifting, strong men, throwing or wrestling. In fact, most of the ways humans lift heavy objects are the active efforts of the legs. I mean, in real life. In a lot of labor, you can see the shadow of squat and hard pull,,,, so a good strength foundation is to have strong leg strength. Among many leg strength training actions, only squat can stimulate thigh muscles (especially biceps femoris and gluteus maximus) best and most effectively. Training will certainly thicken the thighs and increase strength, but generally the calves will not thicken because there are not many muscles involved in the calves. . . . . Ha ha. . . . .