I wasn't hunting at the time, and I'm no lightweight now, but a number of years back I got the shock necessary to make me lose weight. I was at almost 260 at 5 foot 7. At my annual physical, my doctor informed me that I had become diabetic, solely due to my eating habits, sedentary work/life and excess weight. He said he wanted to put me on insulin shots immediately, but could wait and try just a regimen of pills and see how things went if I was willing to get really serious about exercise and and diet and lose at least 70 pounds. I was really, really scared, as I had lost two family members to diabetes, one having lost a leg before she died. I replied that no one had ever explained it to me quite that way.
I joined the Volksmarch program, walking daily and doing at least one six mile walk every weekend, as well as attacking the diet. Over the next two years, I got down to 185. This was almost 20 years ago. I don't walk as much any more (can't), but I still exercise and control my sugar and fat intake. I got back up to 205 last year, just from getting diet careless and not walking as much, but now I'm on track again, taking it down... at 190 right now and aiming for 180. It gets a lot harder after age 65 and harder yet after 70.
Believe me, I miss the goodies I used to eat all the time and now have to ration to occasional treats, and I barely remember what beef is. Bacon and fried foods are just an historical myth in our house. I'm still on the pill regimen, but I know damn well I wouldn't be here right now if I hadn't taken action. And to get back to the original question, I went on a hunt last year, my first, and I'm proud to say I was able to handle it, even did one long walk to work off the adrenalin after I shot my first javie.
So... THINK! You like living, you love hunting, you're seriously overweight? Do something about it now. If you have the will power and concentration to learn to shoot a bow well, you should be able to apply those traits to getting yourself healthy.
Sorry to get so darn serious, but guys, obesity is a cause of many health problems, some life threatening. It's no laughing matter. My doctor once told me, "Dick, the spine is a column, not a cantilever!" Spend at least as much attention matching your spine to your body weight as you spend matching your arrow's spine to your bow...