[Pull-up" exercise] Place a steel bar on the gate, with your body on your back under the steel bar, your heels touching the ground, hold the steel bar with your hands behind your back (the palms facing your end), between the two hands The distance is about 1 to 2 feet wider than the shoulder width, and the arms are straight. The whole body forms a straight line, and then the strength of the back muscles is used to pull the body to slowly bring the chest closer to the steel bar. After a few seconds, return to the original position and repeat the exercise 15 times.
