On this week’s episode WHOOP Global Head of Human Performance, Principal Scientist Kristen Holmes is joined by tennis star Bethanie Mattek-Sands. The 9-time Grand Slam champion, commonly known as America’s Rock Star of Tennis, Bethanie has brought a charismatic and eccentric energy to the sport, which has propelled her to 31 titles throughout her career. Kristen and Bethanie discuss how Bethanie started tennis at a young age (2:47), leaning into her true identity on and off the court (7:58), ...