In order to build a rock hard body, you need to work out and try moves that target the parts of your body you would like to tone. These Aquatic Thighaciser Thigh Weights are designed to develop strength and endurance in the pool. They are great for folks who are rehabbing or would like to improve their athletic performance. Weight is adjustable up to 3-lbs per thigh in 1/2-lb increments. The product offers minimal water retention. Pretty useful for training in the pool.