Like any other athlete, a professional sexfighter has to be physically fit. However, the point is not to outdo the opponent with body strength, but rather to boost the own endurance. A clit clash at the highest level can easily take a few hours, provided the opponents are tough enough. This is extremely challenging for the human physique. It's therefore strongly advised to steel the body in order to prepare it for all possible encounters. Fitness and willpower have to be perfectly balanced if a woman always wants to be the better one.