I do a full strength training regiment. Bench,squats, curls you name it, just as if I was a Arnold
. When I started golf 20 plus years ago it I remember I wasn't even allowed to swim for fear it would jack up my swing. Now everyone lifts weights and does strength training for their swing. I started weight training about 12 years ago and it has improved my game and distance.
If you are looking for a good starting point I would recommend the following.
A. Get out of the cart and take a walk.
b. Get some of the bands/tubing to work with (Bands/Tubing are great because of the forces they exert back into the muscle fibers it works the fast twitch muscles)
1. Do Curls
2. Triceps extensions
3. Shoulder Press
4. Secure the bands to a door and do Wood Choppers (Rotating the core)
5. Push ups and Planks
7. Pull ups
8. Leg Raises
9. Stand on the Tubing and hold them to do mini squats (Do them on one leg to work on better balance)
10. Use the bands/tubing to do rows.
I had written an article on the subject of hitting further and which exercises to use, I can see if I can dig it up if anyone is interested. Some folks shun the idea of weight training, but the PGA guys I know all do it. I know it helps me, I put the ball out there over 350 off the Tee box and I am barking on 40 years old, no telling what a young buck could do with proper training. My Dad asked me the same question last year and I originally wrote my article for him to use as a guide. He is in his late 60's and started using the tubing and doing moderate work outs each day and it added distance to his drive as well.