There must have been fifty thousand columns written in sporting magazines on this subject and many of the writers play devil's advocate just so they can get a column out of a very shopworn subject. The lung and heart area of a deer and elk, which are the animals most hunters come out here for, is about the size of a five gallon buck lying on its side. So, if you can't hit a five gallon bucket six times out of ten, or better, at two hundred and fifty yards, stay home. That is the minimum standard. Go take a treadmill test if you live below an altitude of four thousand feet.
More men die of heart attack while hunting than from any other cause.
Get a lot of aerobic exercise as a training regimen for your hunt. Who knows, it just may turn into a healthy habit. Bring soft clothing which you can wear in layers. Wool or Polartec are ideal materials. Get a Lands End catalog and save yourself some money.