In Tokyo, four-time Olympic gold medalist Simone Biles could become the first woman to land a Yurchenko double pike vault in Olympic competition. Two-time World Surf League champion John John Florence and two-time X Games gold medalist Mariah Duran will lead their sports into the Olympic era as surfing and skateboarding make their five-ring debuts. Ever wonder how these athletes make the toughest skills look easy? We've got you covered here.