I experience lower back pain pretty much after every day of riding... especially if I get right into a car for long periods. It feels like a muscle cramp and for sure pulls a disk out (or something) because the pain is intense and I have to pop it back in place pretty much daily. Sure... snow conditions, equipment, setup... those are factors. But the bottom line (I think) is my core is shaped like a twelve pack. When I was younger and made of superball material, I could just go do whatever I wanted to do no matter the intensity level. Now I'm going to have to work harder for the sports I love. We just had a rec center open in our area... hope I can get my twelver in there and knock a few cans off. Until that happens I will continue to medicate and use a crutch when it gets too painful to ride.