Being on the edge. Getting close to the edge. Not wanting to go over the edge. The cutting edge ... Climbers are always talking about it, some even write about it after their climbs. One of my favorite examples was Dougal Haston writing about "The Final Day On The Eiger Direct." However, the passage below written about driving fast motorcycles, seems to do nicely for alpine sports as well.
"The Edge... There is no honest way to explain it because the only people who really know where it is are the ones who have gone over. The others- the living- are those who pushed their luck as far as they felt they could handle it, and then pulled back, or slowed down, or did whatever they had to when it came time to choose between Now and Later. But the edge is still Out there."
Hunter S. Thompson