Squatting and bending posture is not correct, which is very fatal, and will cause great damage to the lumbar spine, which will seriously lead to paralysis of the lower body. The reason may be that the weight you choose is too big, and your core strength is not enough to support this weight. It is recommended to find a fitness partner to protect you and correct your posture. You can also practice the correct posture in situ and then slowly increase the weight.