Thanks Terex. Hmm...100 on Saturday and 45 on Sunday. Did you also do STOKR?
Well I guess I am going to have to say it's me. I did 50 on my slow but cushy touring bike and again, low back pain. I still think the harsher ride aggravated it more but lets leave it at that.
I am also going to Pilates tonite which seems to be working. Really liked the Yoga but without sounding too non-spiritual, it was a little too over the edge for me in that regard. Pilates seems to be a little more scientific.
Thanks to everyone for bearing w/ me through this one.