Well I guess I'll find out. I have a disc problem in my lower back that acts up from time to time. My thinking is to advance the muscle groups in my core and strengthen my back muscles which should help to support the disc. Not sure that thinking is right but I'm going to try it.

I know I have to be careful not to overdo it. My knee started feeling good and I blew it up from way to much biking. 5 days of 6-10 miles and then 3 days in a row of over 20 miles per day really set me back. Ya, I know, I was a big dope. So I'll ease into this........so far (just like the initial biking) my knee seems to love the rowing. Tennis by Thanksgiving? Uh, no  :'(