Learn how to adjust your boxing technique to keep your shoulders from getting tired prematurely when you stand or punch. These small adjustments will help conserve the energy in your shoulders to stay relaxed so you can fight, throw punches, and defend for longer periods of time. Check out "How to Box in 10 Days" (my highly regarded boxing instructional EBOOK & VIDEO): http://www.expertboxing.com/boxing-basics/how-to-box/boxing-instructional-video-and-ebook