Every callus on a guitarist’s fingers started as a blister they played through.

Adaptation begins with damage. The hardened skin that lets someone play for hours was built by tissue that hurt first, and there is no version of the process that skips that stage. Most durability works this way, in bodies and in nerve: repeated exposure to something uncomfortable, at a dose you can recover from.

Notice that the dose matters more than the toughness. Regular short sessions build calluses, and one enormous session builds an injury. Whatever you are getting used to, look for the amount you can repeat tomorrow rather than the amount that proves something today.