Actually, I was wondering the same thing yesterday. On a thirty or forty mile ride, my head is up enough to look over the shoulder of the guy in front of me in the line or down the road if I'm in front or alone. At about mile sixty-five, because of neck fatigue I'm just peeking up to look down the road for maybe five out of twenty seconds, otherwise I'm focused twenty or thirty feet down the road.

Legs, back, arms, and lungs are fine, the only thing that gets me on longer rides is my neck.

Does anyone have recommendations for techniques on the bike and exercise off the bike to combat neck fatigue? By the way, my seat to bar drop is about 1 3/4 inches.