The first category is lower limb movement. Including skipping rope, high jump, pole vault, long jump, vertical jump, one-legged jump, bipedal jump, stair climbing, mountain climbing, hiking, walking, skating, roller skating, skiing and so on. The second category is stretching. Including aerobics, aerobics, rhythmic gymnastics, unarmed exercises, stick-holding exercises, pull-ups, pendants, swings, loops on single and double poles, chest expansion, leg swinging, leg press and other stretching exercises, swimming in summer is also a good project for limb stretching activities. The third category is general sports. Including basketball, volleyball, table tennis, tennis, badminton and other ball games and boating.