I have the two items in the subject line that I use some when I am hanging around inside, like watching a game and doing some curls. What I want most is to add throwing arm strength, probably the weakest part of my senior softball game, especially since I often play outfield because I run very well for an old guy.

Here's a question: suppose I do 8-pound curls until my arm is tired, like maybe 50-100. I don't understand how much good that would do if I did that cycle X times per day almost every day. What would X be?

Same with lifting the weight straight out to the side until the shoulder tires.

Or lifting the kettlebell up and down.

All simple stuff without going to a gym. What does it take to matter?