What part of the elbow is in pain and in what part of the throwing motion does it hurt? It could be forearm tightness or inflammation of the ulnar ligament. Running and cardio will promote more blood flowing to that region of the body due to longer raised heartrate level. A rice bucket exercise program would be a good idea, possibly. Take a normal size bucket from Home Depot or wherever and fill it about 75% with rice....put a baseball in the bucket, grip the ball and go through light pitching motions with the wrist and forearm. Take the ball out and dig the fingers in trying to get to the bottom...opening and closing the hand. Proper warming up and stretching prior to throwing workouts is something I'd suggest as well. Hope that gives you some help...anything else, post back to me. Thanks