A strong core-chest, abs, hips, shoulders, and back-is the source of your body's power, speed, and coordinated movement. As a martial artist, having a strong core helps you to get more out of your training and to respond instantly and effectively to the fast-changing demands of competition or an explosive street encounter.You'll also get over 100 ways to work your combinations, cheat speed, improve accuracy, fight from unconventional stances, practice...