Most people are able to strengthen train their legs to improve their vertical jump. The shoulders are an important muscle that is often neglected. Your shoulders may not be the only upper-body muscle that you use for jumping, but they are the most essential.
My shoulders feel underdeveloped, and it’s a shame. For a strong arm swing, your shoulders are crucial. Begin by extending your arms straight up and putting your hands on your hips. Next, swing your arms naturally. Your shoulders provide the most benefit from arm swings. This arm swing is more efficient if your shoulders are stronger (jump higher).
You can strengthen your shoulders by doing several things.
While some sites sell suppressed training aids to increase your shoulder strength, they don’t seem necessary. To strengthen your shoulders, you can perform a “hand stand pushup” using only bodyweight.
While some people enjoy a Behind the Neck Press, others prefer a Military Press. My favorite exercise for my shoulders are Dips. They work your chest, shoulders, and triceps.
Remember the basic principles of lifting when you train your shoulders.
After warming up, I warm up and do 8 deep dips. Next, I add weight to my ankles. Others use weighted belts, or hang weight from the feet I then do another 8 sets and add an ankle weight to make me reach my “working weight”Then I do two to three sets of eight with some rest between.
Also, I practice upper-body medicine ball work. I enjoy a chest pass as well an overhead or overhand throwing. These I perform a couple of times per week. Usually, 3 sets of 8.