The BOSU® Surge® 40 is a cutting-edge training device built to improve overall health, fitness, and performance. Train better with the Surge® 40. This exclusive Surge® 40 is clear, so you can see the water shifting and crashing. Aiding you in programming and visual feedback for your clientele. Strategically placed angles allow the chambered water to crash and shift, allowing your muscles and core to react and engage on a whole new level. This provides a unique challenge to the joints and stabilizing muscles by forcing the body to resist and control the unpredictable nature of the shifting water. The Surge® 40's weight is fully adjustable and depends on how much water you add or remove; when fully filled the Surge® 40 weighs 40lbs. The 3 different grip options give the Surge® 40 the versatility demanded in today's performance training. From farmer's carries to overhead lunges the Surge® 40 will help you achieve your fitness goals by training your body to react to real-life movements as opposed to static movements. The advanced core training with the Surge® 40 offers over 50 innovative movement patterns that stimulate top-down instability the way it happens in life.