Sullivan was using swimming as a non-impact physiotherapy training when he was advised to compete in a triathlon once rehabilitated. He competed in a few triathlons, placing well in the triathy, but had a recurrence of the tendon problem and had to retire from sport altogether.
Sullivan's recovery involved using swimming for physiotherapy and was later encouraged to participate in triathlons. Despite initial success, he had to retire from competitive sports due to a recurring tendon problem.