I do reasonably heavy weights 3 days a week (actually, I'm off for a month getting PT because I dropped off the bike onto my left shoulder, but I'll be back as soon as they tell me it's safe). I only do upper body and abs during the lifting, since I figure that 28 miles/day 5 days/week riding is good enough on the legs.

Both the doc and the PT said that the strength I have in my upper body helped minimize the damage from the last fall. The PT has to keep telling me to relax my muscles during the isolation exercises.