I'm relatively new to long distance riding and find that 90% of my body can cope with it. After about 60 miles there's still enough left in my legs and lungs but my shoulders/neck/head are in real pain. I suppose that every imperfection in the thin potholed strips of tarmac round here (jokingly known as 'roads') is passed through the bike, through my body and handed to the neck muscles to deal with. I've got a suspension seat post but is there more I can do? Should I try for a more 'bum up' position? I suppose I could run on lower pressure tyres but that would make me slower and probably result in the same pain for a longer time. It's an aluminium hybrid/mountain bike with bar ends and straight-as-a-die front forks (which I'm not going to change).