Well, I just returned form 8 days in the Colorado mountains. My fitness prep was held back by family issues, but aparently I had done enough to survive the experience without too much suffering. Two young 54 year olds and I (69) hiked a couple miles back and camped at 8,300'. Cold and snow made it uncomfortable at times, but the melting snow made the hiking more than a real bitch at times. My pack was likely well over 60# on the way in, but casual hunting to 9K' with a day pack was enjoyable. I did wrench my back on a slip in the gumbo, but took some medicinals and a 3 hour rest and recovered OK. It may have been a different story if we had actually shot anything, as that would have required multiple pack trips out. At home, my muscles are not sore at all, but do have a bit of sunburn and a pair of really sore hips. I'll likely get some replacements some day, but the doctors tell me that I have to suffer some more first.