The sitting posture pull-down action in vertical position is a common fitness action, which can exercise back muscles. Here are some steps:

1. Sit on the musical instrument, step on the mat with your feet, hold the crossbar with both hands, palms facing outward.

2. Inhale and pull the bar to the chest until the arm is straight.

3. Exhale and slowly pull the bar back to the starting position.

Precautions:

-Don't shrug your shoulders when you recover, which will affect the stress of latissimus dorsi;

-don't swing back and forth, always keep your body perpendicular to the ground;

-pay attention to the reasonable control of action rhythm. When resuming exercise, latissimus dorsi is used to control the exercise, instead of completely relaxing, which may easily cause injuries to the shoulder joint and wrist.