I simply want to get better, but have specific non-DG items to do this. Mid 50s, desk job, so some things have suffered over the last 10 years, but I want to use DG to help me really focus on fitness, since I enjoy playing so much. And the best exercise is enjoying what you are doing for exercise...
1) Get in better condition--treadmill, biking, longer hikes, kayaking, short backpacking (I do all these anyway, but want to do more). I want to get through two rounds at Toboggan without feeling like someone beat me half to death.
2) Better flexibility--stretching mostly, every day. Strengthening the muscles/tendons/ligaments involved. The stronger and more flexible the rubber band...
3) Overall weight training-not power lifting, but just mild to medium core training mostly, but also upper body strengthening of joint ligaments/tendons, to better handle the stresses of throwing (just in general, not necessarily from strong-arming).
No specific goals like raising rating, or personal bests, I think if I do 1-3 above and just have fun, getting better will take care of itself really.
Separate from this, is to keep it fun for my kids, 3 of which really seem to enjoy the sport.