Coach Jason Johnson shares his thoughts on hitting the weight room in season in this video. As baseball players, we don't want to get concerned with how much weight we can throw around in the weight room unless we are talking about legs, as this is one of the most important attributes of any power pitcher.. Focus on making your legs as strong as they can possibly be, and take the opposite approach for your upper body. Use light dumbbells to work the intricate muscles of the shoulder and strengthen them to prevent injury.