Karsten Schellenberg, born in 1963, married and father of three, has been a sportsman for 45 years and a trainer for 40 years, with heart and soul. The former competitive athlete trains celebrities throughout Europe as a personal trainer, gives specialist lectures, leads workouts and develops own training programs. As an author, he writes for specialist magazines. He has published a training book ("Kick Ass"), a training DVD ("Training Pur") and various training programs (including "Mach dich krass extrem"). Based on his many years of experience in working with competitive and recreational athletes, he designs workshops for trainers who want to develop their individual skills and gives motivational talks for people interested in sport. On a voluntary basis he works with young amateur athletes.