“…Indeed, enhancement is part of sport and, in this context, sport is a laboratory of ethical issues related to human enhancement [9] and there are many opinions whether these and other physical and cognitive enhancement techniques should be allowed or not. On the one hand, stand the pro-enhancement defenders, according to whom athlete enhancement is a part of sport and a place where human limitations can be challenged (an "instantiation of the essence of sport" [9] (p. 45)), whereas on the other hand, there are the opponents, bioconservatives, who consider that enhancement clashes with the idea of the normalcy of a human athlete, and in particular, disagree with substantial or "transformative changes" that alter the athlete's individual experiences and feelings [9]. However, when neither shortnor long-term effects on athletes are all that clear, cautionary principles should apply, yet at the same time that does not mean that these techniques should be prohibited altogether [8,9].…”