I used to make rock climbing some years ago (16 years passed), so I can tell you a bit of it. Everything is about coordination, balance, strength and precision where your legs and feet are your most important instrument for upward motion. It’s about concentration and overcoming your fears for the void.
One, quickly learns how to use the tiny parts of the rock, that can be used by 4, 3, 2 or even one finger. The same applies to the feet.
Up there, you don’t count on much…just tiny parts of the rock….and off course, the more you progress the more difficulty becomes.
See below picture!
It’s almost nothing that he get’s there to “Graft” in to that rock and climb!…In live, that’s exactly what we need to progress….A tiny thing,opportunity or chance and place ALL OUR STRENGTH ON IT!…