Liston, however, brought weaknesses into the Clay fight that were not fully apparent at the time. He claimed to be 32 years old at the time of the bout, but many believed that his true age was closer to 40, perhaps even older. Liston had been suffering from bursitis in his shoulders for close to a year and had been receiving cortisone shots. In training for the Clay fight, he re-injured his left shoulder and was supposedly in pain striking the heavy bag. He secretly resorted to heavy icing and ultrasound therapy after each training session. And, ironically, because of his dominance, Liston had actually logged little ring time in the past three years. Between March 1961 and the Clay fight, Liston had fought three times and won each bout with first-round knockouts—meaning that he had fought a total of just over six minutes during a 35-month stretch.