I went out for a snow shoe treck on Friday - 850m climb and 6km each way - I wanted to give up after about half way up the mountain but was not allowed to :(
I was totaly exhausted by the time I reached the top and took a couple of photos but as I arrived so long after the rest of the group they were starting back down about 10min after I arrived.
It was a great place with ideal weather for photos but I think part of my problem in the first place ( apart from being VERY VERY unfit ) was the Dslr, two lenses and other assorted camera items in my backpack!
http://www.rubble.info/donotdelete/decent.jpg