THE CRUNCHBALL IS A BRAND NEW ADDITION TO OUR CORE TRAINING LINE. TONE AND STRENGTHEN YOUR UPPER, MIDDLE AND LOWER ABS AND OBLIQUES. STRETCH YOUR BACK FOR INCREASED RANGE OF MOTION AND BACK PAIN RELIEF. PROMOTES PROPER FORM AND INCREASES THE ISOLATION OF YOUR LOWER BACK OR ABDOMINAL MUSCLES. THE CRUNCHBALL USES A NEW PATENTED RESISTANCE MECHANISM THAT VARIES FROM EASY TO MORE DIFFICULT BASED ON THE START POSITION OF THE POWER ARMS. THIS UNIQUE APPROACH ALLOWS YOU TO TO DETERMINE WHETHER YOU FOCUS ON STRENGTHENING THE ABDOMINALS OR THE LOWER BACK REGION