I'm 71 and can still enjoy 10-15 hour days in the saddle. The first thing is to get your back position correct. http://www.bikeforums.net/road-cycli...discovery.html

The exercises described above are all good, though I've never done them. Instead I've always done ordinary gym work. I do one thing that's not ordinary, though: hanging. Once or twice a week, I hang by my hands as long as I can, three reps 1' apart. Just straight arms, relaxed. It's too bad we don't play on jungle gyms anymore. Climbing is supposed to be a natural part of our lives.

Otherwise, it's dumbbell work: shrugs, seated dumbbell presses, front dumbbell raises, rear dumbbell raises, side dumbbell raises. As long as you have them out, might as well do concentration curls, bench presses, and straight arm pullovers. Never had a neck problem so maybe it's like keeping the elephants away. Be that as it may, it's worked for me for 50 years. Randonneurs who have had Shermer's Neck have gotten themselves fixed by doing this dumbbell work.