This is the page I’ll be updating with the results During the early 1990’s, Graeme McMahon monitored the heart rates of climbers using various canopy access systems. In comparing spurs, prussic, frog and yosemite, he found the single rope technique
This is the page I’ll be updating with the results During the early 1990’s, Graeme McMahon monitored the heart rates of climbers using various canopy access systems. In comparing spurs, prussic, frog and yosemite, he found the single rope technique