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Another possibility is that individuals with weaker hands or with OA-related difficulties may self-select themselves out of climbing. If an individual tries rock climbing and does not excel at it, or worse, experiences pain from it, they may decide to quit (or never take up) the sport. Those remaining long-term and at elite levels may be those who had healthier hands before beginning. The higher incidence of OA among the non-climbers, however, is most likely a spurious result of the sample.

Factors influencing osteological changes in the hands and fingers of rock climbers
This study examines the osteological changes in the hands and fingers of rock climbers that result from intense, long-term mechanical stress placed on these bones. Specifically, it examines whether rock climbing leads to metacarpal and phalange modelling ...

TL;DR NATURAL SELECTION, MEN WITH WEAK HANDS QUIT WHILE THE STRONG CONTINUE.