here is my take. I have done a couple of triathalons( i don't get the point) and love sheep hunting. I am an avid mountain biker. I have to stay in shape year round.
Climbing hills with weight on your back is an excellent work out and a good way to make your knees hurt after to much working out. A good way to climb hills and save the knees is to climb with jugs of water in your pack. at the top dump them out and climb down. you get the weight for climbing and save the knees coming back down. this wouldn't be possible running stairs. to much time dumping and adding water. aslo you do a 6 hour mountian bike ride thru big country every weekend and come hunting season you will fly up those hills.
carbs: you need them. that simple. but you should only eat them when you need them. If you are not excersing or doing anything that day, say sitting at the computer all day. don't eat any carbs. going out for a 3 hour bike ride with the boys after work. eat pasta with meat sauce. You balance your food intake with your calorie outake. But if you where to backpack hunt all season with no carbs, your body wouldn't be able to do it. remember the cave men didn't excurt hours upon hours of high heart rate excersie unless a wolly mammoth was chasing them. Our diet can mirrors theirs. but we also need to add carbs for those days you will excirt lots of energy.
First of all, if you haven't gone winter backpacking, it needs to happen in the near future. It puts a very unique twist on the summer version of the activity. Yes, it's cold but it's nothing that being prepared can't remedy. Beyond it's therapeutic and recreational value, I think it is a very good tool for the big game hunter as well. I don't think that you can spend too much time getting to know the ins and outs of the area that you hunt. And there is no better way to gain experience in...