chest equipment" 或 "chest armor
A type of auxiliary equipment used in sports, equipped with springs, which can be pulled open with both hands to practice, which can enhance the strength of chest and arm muscles. Also known as Dumbbell。
The use of chest expanders
1. Grip the chest expander with both hands, with the arms at the same height as the shoulders. Strenuously pull the chest expander back to form a straight line with the body, then return to the original position.
2. Grip the chest expander with both hands and lift it to the top of your head, making sure your hands are straight. Then pull it down to form a straight line with your body, and return to the original position. When pulling down, you can pull the chest expander to your chest or to the back.
3. Lie down, raise the chest expander to the front of the chest, extend both arms, pull the chest expander to a straight line with the body, and then return to the original position.
4. Stand upright, step with your left/right foot onto one side of the chest expander, and hold the other side of the chest expander with your left/right hand to pull it up, which is similar to lifting a dumbbell.
