haven't been riding very long and i love it and proud of my progress. i am riding up to 15 miles with ease. the only thing is my rear-end. after an hour or so my bottom hurts so i have to give it up. the question is is this something i have to hardened to or do i have the wrong saddles [if you think it could be the saddle please tell me how to select one] or am i just a softie or what is the problem? you guys that ride for a day at a time what is your secret? i love biking and would like to work up to maybe to fifty or sixty mile trips or even more. all suggestions will be appreciated.