The key to hard pull is to be able to do the correct posture of squat. Generally, our usual squatting posture is wrong. Usually we always stand there straight and then squat down, but that posture often hears the noise from the joints of our knees, which is normal, because our posture does not affect the joints.
Squat posture means that the buttocks should sit back hard, as if there is a chair behind them, and then lean forward slightly. When you squat down, your ass will start to sit back. It must be noted that the knees should not exceed the toes. It must be done. If you exceed it, you will definitely make mistakes. It is best to squat to 90 degrees for thighs and calves.
Hard pulling is to bring a barbell when squatting, but you should find the right feeling in your legs, otherwise your waist will be very tired and may be damaged. I don't pull very hard. Generally, I try to relax after pulling the barbell with my arms. There is a trick, as long as my hand is not too tight and not too hard, let my hand slowly loosen, you will feel that the arm is no longer hard, and then the weight basically reaches your leg, and then you can start to pull slowly and squat down.
Another kind is not squatting, that is, after standing up, pull up the barbell with your hands and make your legs as hard as that feeling. After that, don't straighten your legs, pull your knees forward a little, just pull them like this, and it will be hard for a while.