Training Ukrainian boxer Vasyl Lomachenko is done by his father with some assistance from a psychologist. It includes street skating, juggling, handstands, solo tennis, marathons and 10-kilometer swims. Sparring sessions are 15 four-minute rounds with 30 seconds of rest in between. Fresh sparring partners rotate in every three rounds unless they are overwhelmed by too many punches, in which case they rotate sooner. Each punch is recorded and calibrated via computer chips that are placed in Lomachenko’s hand wraps.