These Natural Fitness Soft Weighted Balls bring a new element to your workout. They are environmentally friendly, nontoxic and constructed of a latex-free vinyl. The 2-pound pair of weighted exercise balls are filled with natural sand and iron for exceptional resistance. They are a soft and fun alternative to dumbbells to give your fitness routine variety. The spheres can be used for Pilates, fitness and strength training, as well as yoga and rehabilitation. The included instruction chart provides a full-body workout for maximum results.