does training the forearms increase velocity? i noticed in this video, scott kazmir has monster forearms
when he's introducing himself
Probably not that much. Velocity comes from good mechanics, strong legs and core, stable arm muscles and slow-down muscles. So I doubt a strong forearm would get you too much velocity.
It can, but only very slightly, and only if you train them correctly.
Train your pronator teres.
how do you train the pronator teres, what exercises?