Had a little accident a while back. Two neck operations later were a number of vertebrae were fused I bought a hybrid and start cycling. Every time I cycled my hands would go numb and I would develop a migraine, all within a 100 meters of my starting point!
So on the advice of my doctor I started rowing to strengthen my shoulder and neck muscles and got a bike similar to RonH.
It works, now I do 2 to 3 hour routes without any pain.