I would like to recommend that anyone doing overhead and/or bench presses do so with dumbbells instead of barbells so that your palms face each other, instead of facing outward when you use a barbell. The reason for this is because these movements with a barbell/palms facing outward can put tremendous strain on your rotator cuff muscles and possibly cause impingement and/or a possible tear in the rotator cuff muscles. I know this from past experience and from rotator cuff/impingement surgery on both of my shoulders. That's not to say everyone will have the same problems I have, but boxing is stressful enough on the shoulder joint without adding too much additional stress from lifting weights.