Boxing as it pertains to the Xvest. In Boxing you must have endurance and hand speed; you have to be able to stand on your toes and duck and move and punch at multiple angles. The Xvest can be incorporated into your shadow boxing, your roadwork, hand speed and quick hand drills. The Xvest incorporates a D-ring attached in the front and back, creating resistance for your upper body and handwork.  When you condition your body with this heavier weight, once you take it off and do your sparing, you'll find that you'll be quicker. Your hands will be quicker, your legs and feet will feel lighter, you'll be able to move around the ring better and your conditioning will be at a higher level.