Careful, the wanting can quite often be better than the having. When I shot heavy bows, a few fellows bought them as well, even though I would advise them against it. Very soon after they got their heavy bow, most of them wanted to know if I wanted to buy it from them. A good way to tell what you can pull, is to grab two Hills in your bow hand and pull them back at the same time. I can draw two 64 pounders left and right handed a number of times. The last thing I would want to shoot is a 100 pound bow. Even for exercise purposes one should be able to draw the bow back with proper form, if it looks like one "could cut washers off your rump", like Hill used to say, and you need to go through odd contortions to get the thing back, the exercise will not help your current shooting either.