Masturbation is great for the right arm
Dry deliveries. That helps when I get the ball back in my hand - like I never really stopped throwing. The goal for me is to increase arm strength.
One thing I can't do, and I hope that there are other people out there that feel the same way, is climb a rope. Oh my gosh, it's so hard to climb rope! It's all about grip and arms.
Long Toss! Far and away themost important drill for strengthening my arm.
I've never done any arm-strengthening drills.
Use now and then a little Exercise a quarter of an Hour before Meals, as to swing a Weight, or swing your Arms about with a small Weight in each Hand; to leap, or the like, for that stirs the Muscles of the Breast.
The only way you preserve pitching arms is throwing; that makes the arm stronger.
Push-ups are seriously the best way to tone your arms - and they tone your abs at the same time! I like to do them when I'm home watching TV or listening to music.