Very simple and easy to use. Hold the dumbbells with both hands, naturally droop to the sides of your body, lunge down, and keep your upper body straight. 15 group change legs and do another group. After the leg change is completed, pause for 30 seconds (at most one minute). Please pay attention to keeping the upper body posture, which can effectively stretch the abdominal muscles (including abdominal muscles and rectus abdominis) and effectively contract the hip muscles. This is a kind of self-cultivation abdominal muscle exercise. Persistence will certainly help you.