What is said upstairs will have no effect in a short time. Pull-ups rely on muscle strength. If you can't do muscles, it will be difficult to achieve 20, and muscles are not so easy to practice. However, I can teach you a method that is effective in a short time but a little dangerous.

When doing pull-ups, relax your hands as much as possible, put your hands outward, and then try to pull your body up and hang it on the horizontal bar, and don't come down until you can't stand. Your shoulder, latissimus dorsi and big arm will be very painful by this method, and it may also cause muscle strain, so you should do what you can and stick to this method, and you will not feel pain in about 20 days. This is a way to paralyze muscles and make you feel creatine.

But this can only make you do five or six more, so when you do the above exercises, you should also do muscle exercises. The picture on the third floor is almost enough. Even if you can't do one before, you can do more than a dozen.

Also, don't try to be brave in this way. If you feel a muscle injury, stop it immediately. Remember.