Sorry just realized I didn’t address the pitcher line.
Pitchers do not do as much conditioning relative to their position as you don’t want to increase the repetition of the throwing motion. So, the upper body work is often focused on increasing endurance and stability. Things to decrease the risk of injury to the rotator cuff, the elbow, the wrist and hands are indicated for pitchers.
Pitchers would still be wise to work very similarly to all other positions for the core (abs, spine, etc.) and the legs (sprints, start/stop drills, etc.). If you are really serious about this area of study, I do teach instructors in learning to apply conditioning principles to sport specific activities. Check out my website (www.hawaiifitnessacademy.com) and get in touch with me if you are interested. I usually prefer to have instructors come to me, but I make exceptions to distant learning if the client seems able.