Ugh..my back

I just got back from a 3 hour ride on my singlespeed. Why would I do that you ask? Well, mostly because its the only bike I have that is functional at the moment. The Turner is majorly jacked up from me trying to fix my front derailleur on Sunday, and Chris hasn't had a chance to work on it yet. The Scott needs some work too as I put some Ergon Grips on it and now I can't reach my brake levers. Even my cyclocross bike was missing pedals and I was too lazy to swap them, so the only other dirt worthy bike I had left was the singlespeed. I seriously don't know how some folks can ride a singlespeed for so long. I guess you must just build up a tolerance to it. My lower back is pretty worked, not to mention my legs feel like I rode for 6 hours and not 3. I do like the simplicity of it and it sure does go fast on the climbs...with a good bit of effort on my part, of course. I still don't think I'll be taking it on any huge climbing rides anytime soon...