a few thoughts and a warning
I'm interested to know if anyone can direct me to some fast twitch exercises for the forearm and bicep of the shooting arm. I recently started working out several times a week and want to build type ii fast twitch muscle instead of bulk up to increase break speed.
A lot of things could help, hard to beat light free weights and moving them as fast as you can, dumbbells. I had a great set of exercises to do complete workouts using only dumbbells long ago, you might find something on the net. If not just repeat the motions of a stroke very rapidly with a light dumbbell.
There is a major catch to trying to develop only fast twitch muscles though, repetitive motion disease. The type of exercise to focus only on fast twitch muscles is an excellent way to annoy tendons, nerves, and joints, perhaps requiring surgery. I stopped when I first noticed issues when I was exercising to increase my speed and working daily on a fast draw for pistol competition.
I'm sure you have already considered this but an accurate break is better than raw speed. Hitting the head ball just a tiny bit off center negates a lot of speed.
Search youtube for colincalypso. Not sure of the spelling but reminding others reading this thread will probably cause someone to come forward. I might have the last name misspelled or totally wrong. Colin worked extensively on speeding up his break by getting more parts of his body in motion. He had an excellent video. Perhaps somebody else still has it. More speed to be found getting more parts moving than the tiny increase in fast twitch muscles I believe. The wrong exercise or too much of the right exercise will slow you down. It's very tricky trying to work on maximum speed of any single movement.
Hu