Lie supine on a stability ball with the ball in the arch of your lower back and hold a weight plate, dumbbell, or medicine ball directly above your chest, arms outstretched. Do a crunch, reaching towards the sky while holding the weight. Pause for one or two seconds at the top of each rep. Don't sit all the way up (with your torso perpendicular to the floor). That removes the tension from the abs.
Slowly reverse the motion, allowing your abs to stretch over the curvature of the ball. Don't allow your neck to hyperextend in the bottom position; keep it in a fairly neutral position throughout.
– Nick Tumminello
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