John Gill––seen here performing a one-arm front lever––was a mathematician and climber who revolutionized the sport in the 1970's.
He referred to climbing as 'intimacy kinesthetic meditation' saying, "I've always been able to appreciate climbing as a sort of moving meditation. I have routes wired to such a degree that I don't have to think about climbing on a conscious level. I become involved with the flow and the pattern of the climb. I lose touch with who I am and what I am and become part of the rock––I've actually felt at times as though I was weaving in and out of the rock."
Roger Bannister, decades after breaking the four-minute mile, related a similar out-of-body experience: "No longer conscious of my movement, I discovered a new unity with nature. I had found a new source of power and beauty, a source I never dreamed existed."
Today we rather less eloquently call it 'the zone.'