Knee lift trainer is mainly used for exercising various muscle groups of upper limbs. It is a conventional fitness equipment suitable for indoor fitness. It has obvious effect of exercise and fitness. Long-term use can shape beautiful upper limb muscle curves.Instructions:1. The distance between the two bars is preferably wider than the shoulders. Hold the bar with both hands to form a straight arm support, lift the chest, and close the abdomen. The legs are straight and close together to relax and sag.2. Exhale, bend your elbows and arms, and lower your body until the arms are bent to the lowest position, the head should be drawn forward, and the elbows should be abducted, so that the pectoralis major muscle is fully stretched and stretched.3. Immediately inhale, support both arms with the sudden contraction of the pectoralis major, so that the body rises until the arms are completely straight.4. When the upper arm exceeds the horizontal position of the bar, the hips are slightly retracted, and the torso is in a posture of "lowering the head and holding the chest".5. When the arms are straight, the pectoralis major is completely.