Bruce Lee took advantage of his time by training his incredible abs unnoticed while sitting in boring meetings. He isometrically contracted his abs by pressing his lower back into a chair. There was no apparent movement, but his rectus abdominis muscles were receiving a secret, awesome workout.
Your torso is a vital area for you to tone and strengthen if you want to increase your power. Torso exercises stabilize the spine, protecting you from injury. Abdominal muscles allow your torso to turn, twist, and bend. Your waist connects your upper and lower body to generate the tremendous torque necessary for dynamic punching and kicking. Solid abdominals are essential to make this connection. Strong core muscles also enhance your balance, protecting your internal organs.