Everything in moderation.

If you feel dizzy and short of breath, stop for a short bit during the drag, sit down and have a cigarette.

Not!

I dragged out my first deer last year, about 100 yards up a steep incline, and thought i was going to die once or twice, my heart was beating so fast. I finally got the hint and took it slowly over the next mile I had to drag the deer. And to think that I used to ride mountain bikes 35+ miles a day only three years ago.

Just don't rush things, take your time,and it wouldn't hurt to walk the dog at a brisk pace once every day.

Oh, bring some aspirin with you into the field...just in case.