Strained a few muscles in my back when I got off the bike this morning, and the resulting pain caused me to lose control over my legs for a second. That was enough to put me on the floor
Right now, whenever I make a wrong move, it's like they're thrusting a sword in there and my legs just give up.
It's going to take a week or so before I can properly walk again, and the doctor has banned me (for life, no less) from riding any bike that has the handlebar below the saddle. So my choice of old bikes will be severely limited. Certainly no more Sbikes.
Interesting that as I've always found the more upright the riding position the less time I can spend on the bike before I get back ache. A lower front end mean that I can rest more of my upper body weight on my arms and shoulders rather than supporting it with my lower back.
Oh and I hadn't even noticed it was Friday the 13th until I saw this thread.