The main exercises in this exercise are rectus femoris and iliopsoas.
Even if it thickens, it will thicken the thighs. Although the weight is tied to the calf, the muscles of the calf (gastrocnemius) do not contract at all, so there is no possibility of thickening.
There are only two movements to train the calf, that is, standing posture and sitting posture, and heel lifting is heel lifting. Besides, there is no other exercise to train calf muscles (soleus and gastrocnemius).
The buddies downstairs are not kind. You didn't copy it.
If there is something wrong with the half-moon wrench, do not stretch your knees as much as possible (don't squat) and don't twist your knees, otherwise it will easily form joint rats, and your knees may get stuck when walking.