2, sit-ups (people usually do the same action, but sit-ups can evolve into many actions, and the abdominal muscles developed by different actions are different)

3. leg press (inner thigh muscle)

4, bending, legs straight, hands touching the ground (calf muscle shaping, abdominal muscles, hip muscles), intelligent dumbbell dumbbell is a very cost-effective equipment, not only easy to use, but also "multi-purpose." Now chrome steel "smart dumbbells" are available for sale. Just turn the digital turntable at the top of the dumbbell and you can choose six different weight levels for different people to exercise. Soft ball, a big soft ball made of ethylene, can be used to exercise strength and flexibility. Put the soft ball at home, and the bodybuilder can do various stretching exercises on the ball; Sitting on the ball can exercise the strength and flexibility of different parts of the body. If the home is small and there is no place to put this big ball, you can use it instead of a chair. People sitting on a big ball can exercise their strength and improve their balance. Exercise is for fitness, so you should have a good mood to practice, and don't force it. Generally, the best exercise time is 45-60 minutes, and the total amount of exercise at a time cannot exceed 90 minutes.