My son suffered a stress fracture of his olecranon a few months ago, and then re-injured it when he was doing his rehab throwing program. He’s currently in his 2nd week of a 12-week shut-down, with no throwing whatsoever while he heals. He’d still like to do what he can to improve as a pitcher during this time. He’s working with a physical therapist on general strength and flexibility. I’m wondering if anyone can recommend any exercises or drills he can do to improve his pitching without throwing a baseball (lower half, mechanics, etc.)?