2) Alternate back movements: pull down before the neck (musical instrument); Sit and row; Pull-ups;

3) Alternate thigh movements: sitting and kicking (equipment); Smith squats; Sit and flex;

4) Alternate leg movements: sit and lift the heel (instrument); Stand up and lift your heels; Barbell lifts the heel;

5) Alternative shoulder action: sitting posture pressing (instrument); Push the barbell to the front of the neck; Dumbbell push;

6) Alternate action of three heads: press down the steel wire (instrument); Flexion and extension of dumbbell neck and back arm; Flexion and extension of the back arm;

7) The two heads alternately move: the instrument bends (instrument); Dumbbell bending; Barbell bending;

8) Alternative abdominal exercise: sit-ups (instruments); Lift your legs on your back; Supine leg flexion and extension;