"Pitching is not a strength activity. It does not require much strength to throw a 5 oz baseball. There are 10 year olds who can throw 70 and 14 year olds who can throw 80…without having spent time strength training. Speed of movement and momentum and quality mechanics are for more important in pitching than strength.
If you are lifting weights as a pitcher or you know someone who is please do yourself a favor. Run, do your band exercises, strengthen your core and legs. Stay away from Olympic style lifts!