Like Bob said, don't get out of shape to start with. However, we all have those lapses. I really don't think there is a real "quick" way to get in shape. It takes some time to build up strength and endurance. And age also plays a major role. I use to do a lot of running but for the past 5-6 years have not been able to run do to a sciatic nerve problem in my right leg. So I use eliptical machines and treadmills. I go to a gym like Snap Fitness where I have access to various machines and equipment. I try to get there at least 3 times a week and spend 30 mintues doing cardio where I get my heart rate above 130, then spend another 30 minutes on the weight machines working both my legs and upper body. I also try to do several minutes of stretching. I think the stretching is very important and know I don't do enough. This year I'm going to try and do a stretching routine before each hunt. Kind of like getting loose before an athletic event. I'm 63 and the older you get the more important it is to establish some kind of exercise routine and maintain it.
If you are extremely out of condition and/or severely over weight you should consult with your doctor prior to starting any strenuous exercise program.
