The most common exercises for strengthening your arm muscles include:
Biceps:
Seated curls
Standing curls
Triceps:
Tricep extensions
Lat pulldowns
Pull Ups
Dips
Forearms:
Reverse curl
Wrist curl
Rock climbing
Hold your arm above your head and extend arm then bend to touch fist to shoulder. Do not drop arm. After doing for short while you will feel arm muscle strengthening.
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Look into exercises that strengthen the shoulder, as that is where much of the force is generated. In addition to the deltoid, you would want to target rotator cuff muscles since these control the actual joint movement. It is also important to not neglect the lower body, especially to improve stamina.
chin ups - its works out the muscles heavily. pull ups - For builds back and arms muscles. push ups - builds chest, shoulders and arm muscles. one arm push ups - for arms and back, need to do the same amount for each hand.
By working your whole body. L-Sit is a very demanding exercise that uses your whole arm muscles and your core muscles. This is why a strong core and strong arms lead to better success in the L-Sit. You can strengthen your abdominal muscles with exercises like plank, hanging leg raises, dragon flags etc., and you can strengthen your arms with exercises like chin-ups, pull-ups, dumbbell curls.
Chin-the-bar and Push-Ups.
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For throwing, particularly in baseball, you want to strengthen and stretch the muscle groups in the shoulders and elbows. (Forearms are generally seen as the seat of power for hitters.) Focus on exercises that keep the tendons and ligaments in the joints healthy
Range of Motion exercises will help to strengthen the ligaments. These are done by rotating the straightened arm in a circular fashion in one direction and then in other direction. Also one might try some light weight strengthening. This is done by hold a small amount of weight in each hand and then lifting the arms straight out from your sides til they are levels with your shoulders and then lowering them again slowly, then repeating.
An elliptical is an exercise machine that uses walking and arm movement. Exercises done on an elliptical can generate more weight loss because you are using more muscles.
The easiest and cheapest way is for you to do pushups and pullups at home. At the gym you can do both bicep curls (to work the top of your arm) and tricep curls (to work the underside of your arm).
If the nerve injury has healed then it's "just" a matter of slowly starting to use the arm more and more while focusing on range of motion rather than on weight. If the nerve damage is persisting there isn't much that can be done.
General toning, some strengthening to the muscles. And flexibility of the shoulder is the biggest benefit.
The muscles of the arm are natural tighteners to the skin of the arm