Flexed leg hard pull is a frequently used fitness movement, but also the lumbar disc herniation patients in the later stage of the exercise of lumbar muscles is very good exercise, can enhance the stability of the lumbar spine. Flexion is also the action of bending the knee deep squat, while the hard pull refers to the action of lifting the weight with both hands, usually choose barbell as the weight for exercise, if the weight is too large, you need to use the waist and wrist fixation belt, fixed and then exercise. Bent knee pulling action needs to be standardized to be able to play a role, first of all, the direction of the toes, need to open slightly outward, and the width of the two feet to be wider, the knee joints in the squatting as far as possible do not bend too much, the most important is the waist and back muscles must be tightened before the start of the action, straighten the waist and back, to reduce the pressure on the lumbar spine and thoracic vertebrae, the neck must be slightly stretched backward, looking forward. This action can fully exercise the body’s multiple positions of the muscles, especially the waist and back muscles and leg muscles, enhance muscle strength and circumference, but also to increase the body’s metabolic rate.