The important thing to recognize is that fairness is a pretty fuzzy concept and a lot of the boundary between fair and unfair is defined by particular societal norms (socially constructed, if you will).
All elite athletes have biological advantages not afforded to ordinary humans like us. People like Michael Phelps and Alex Honnold are specific examples of course, but even after years of training most people cannot perform anywhere near the level that elite athletes do.
Now, which biological advantages are fair and which are not is determined by society. We have somehow decided that chromosomal advantages are unfair, even though people have exactly as much control over them as they do over the amount of lactic acid they produce or how their amygdala behaves.
All elite athletes have biological advantages not afforded to ordinary humans like us. People like Michael Phelps and Alex Honnold are specific examples of course, but even after years of training most people cannot perform anywhere near the level that elite athletes do.
Now, which biological advantages are fair and which are not is determined by society. We have somehow decided that chromosomal advantages are unfair, even though people have exactly as much control over them as they do over the amount of lactic acid they produce or how their amygdala behaves.