My opinion on some of your questions......

Yes, being active and in good health will be better for you in the long run.

I do not believe that shooting a "lot", in itself will cause you harm.

Improper warmup, and shooting too much weight for your body will hurt you at some point.

I shot on average.....well over 1000 arrows per week, every week, for almost fifteen years. Much of that time was shooting at over 80lbs.[]

I had to have my left shoulder redone(I am left handed) 2 years ago. It was a severely torn rotator cuff. I tore that rotator playing baseball in 1980.

The rotator surgery was not that bad. I was shooting again in 11 weeks.