It's like a rapidly spinning vortex in your hand; the faster the engine spins, the more inertial resistance it generates, working your arm harder and harder until your muscles are burning and screaming for you to stop. And because it’s pure isometric resistance, Powerball engages almost the entire group of fibers in each muscle that it’s exercising, ensuring that you’ll reach fatigue in a much shorter time frame than with traditional exercise methods (in fact - less than 30 seconds if you really accelerate the Powerball’s rotor speed)
Put down your dumbbells and take a fresh look at the way you exercise - small balls really can build arms of steel.
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Isometric exercise is ruthlessly efficient and will instantly engage almost the entire mass of the muscle being exercised. The faster you spin the harder it works, leaving the arm of even the most highly trained body builder or athlete pumped and ripped in less than one minute flat.
Isometric exercise will typically stress the MUSCLE as opposed to the TENDON (attached to that muscle) and therefore Powerball can be beneficial in helping to strengthen, rehabilitate and train around injuries caused by traditional isometric weight lifting exercises (scar tissue around the elbow joint for example)
Everyone's fitness goals are different. 98% of women want to keep their arms toned and shapely but don't want to build lean muscle. Powerball's unique variable resistance isometric workouts allow women to do exactly that spin slower and longer to give sharp, firm toning of the triceps ("the dreaded bingo wings"), tightening the muscle but without any undesired size/mass gain