In doing a negative crunch you have to sit down with a tall torso; and legs slightly wider that your shoulders; your knees should be high reaching your chest. Stretch out your arms with your palms facing each other and elbows locked in. Pressurizing and creating resistance for your body; and with changing the posture of your legs; move yourself slowly backwards till you are completely lying down, now move your stretched arms over your head. Now for the real negative crunch, pull your arms back in line with your chest and then pull your shoulders back into the starting position.
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