I prefer climbing a mountain, and yes, I have done so, several times. Nowdays I prefer staying on trails instead of going up on glaciers, and I was never into rock climbing very much.
I don't believe that marathon running is healthy for most people. It puts a tremendous strain on the body, not to mention the joints in the knees and ankles. I wonder how many multiple marathoners end up with severe arthritis in hips, knees, ankles?
A person can run for excercise and that is great – I used to, but 25 miles? Do you know what happened to the guy who started the whole thing? He was Greek, I think, and he ran 25 miles to tell his officer how a battle had gone. He died right after giving his message.