Although I've done a lot of things that were a lot harder in life in terms of physical demand. This may just be one of the toughest things I've done. I'm out of shape, I work from home sitting on my butt and don't get out much so when I decided to climb to 10K on Mt Rainier to ski down on Independence Day, I almost bit off more than I could chew.
After about a quarter of the way there I ran out of steam and was pretty much just digging down deep to keep going with my 55# pack. Yet another good reason to get in shape I suppose ...this climb didn't need to be so hard and would have been over in half the time had I been in good shape.
I am proud of it though since I haven't had to dig down deep like this in about 10 years.
I only wish Monty would have been allowed on the trail. ...and not just because I would have tied the pack to him and made him run up the hill.
Camp Muir above me
Mount Adams 12,281
Mt Saint Helens 8,365
Mt Rainier Summit 4,000 feet away