From the 1950s into the 1970s, both rumors and facts of performance-enhancing drug use combined to increase actual use. Many athletes seemed to believe they had to use in order to remain competitive. Those athletes who require bulk and strength to be competitive, like bodybuilders, football players, and shotput throwers, were the first to abuse anabolic-androgenic steroids. During the 1970's demand for anabolic-androgenic steroids grew as athletes in speed-dependent sports discovered some of the potential benefits to using anabolic-androgenic steroids. For one thing, the drugs allow athletes to train harder because muscle strains and tears repair themselves faster.