This also reminds of when a mate and myself attempted the Lakeland Joss Naylor Challenge. This is an anytime challenge for the over 50's fell runners. It traverses 48 miles, over 30 high summits with some 18,000ft of ascents and descents, all to be done inside of 12 hours. We were fit as fiddles running 5 or 6 times a week and racing regularly. My pal said lets do it, although I had big reservations, as I knew the route and doubted out chances of success. Well he gave up after 23 miles and I had to abandon after 33 miles, when I strained tendons in my thigh. Sometimes the what the head and heart want to do the body simply cant.