We should distinguish between negative medical interventions (intended to cure disease), positive interventions (intended to improve, within the normal range, functioning) and enhancement (where a person is pushed beyond species normal functioning). It seems that, within medicine in general, even if these distinctions can make a difference with respect to who shall pay for the service, they make no principled difference as to whether the services can be provided. However, in sports medicine, they do make a difference. In this chapter, I investigate what kind of difference. Negative interventions seem to be unproblematic, positive interventions problematic, and enhancement forbidden.