The aim of the paper is confronting internal or intrinsic values of sport detected by different sport-philosophers, such as W. J. Morgan, J. S. Russell, R. L. Simon, N. Dixon, S. Kretchmar, to today’s bio-technologized sports in order to find the ethical guidance for (non)acceptance of new bio-technologies in sport. Thus, in the first part, I will produce an overview of the internal values of sport in the sports-philosophical literature. In the second part, I will provide my understanding of ‘bio-technologized (...) sports’, leaning mostly on W. J. Morgan’s and S. Loland’s previous work in this regard. In the third part, I will show that the key internal value of sport is ‘excellence’ and that the perfectionist account of sport dominates high-level professional competitive sports. However, I will show that ‘excellence’ is prone to different interpretations and understandings which (could) have different implications for the ‘bio-technologized sport’. Finally, I will propose going back to Aristotle and his account of _eudaimonia_ to build principles for the regulation of (non)acceptance of bio-technology in sport. (shrink)