Do yoga balls have sand in them? healthy living. Stress balls are small balls or objects filled with a malleable gel or clay that are held in the palm of your hand. the act of repeatedly squeezing the ball may help to release tension and relieve stress. While stress balls are used to reduce stress, there are additional benefits for using stress balls. stress ball benefits. 5 awesome stress ball benefits diy stress balls. affiliate links can be found on this blog at no cost to you. physical therapy. stress balls can be used to help strengthen your arm and wrist muscles. Think of testosterone as the fuel for your muscle-building fire. some research has shown that supplemental testosterone can add lean body mass—that is, muscle—in older men, but there can be adverse effects. plus, the does using a stress ball build muscle fda has not approved these supplements specifically for increasing muscle mass in men. Progressive muscle relaxation is a deep relaxation technique that has been effect...