Oak and Crankin,

Both of you ladies are onto the probable cause. I am left handed in writing, shooting pool and waterskiing (yes there is a handedness to waterskiing even though you do it with your feet, I'm known as "goofy foot" forward a term for putting your right foot in the front position on a slalom ski) but everything else I do right handed, so I do generally drink my water bottle with my left hand, though I am able to to it with my right also.

I believe it originates higher up in the body, possibly even my neck. Yeas ago when I owned a restaurant and worked on my feet for long hours I used to visit a chiropractor somewhat regularly, but off and on, and had issues with sciatic nerve and back pain. I haven't had that in years except I've had a slight twinge in my left lower back recently and I've spent the winter sitting far more than usual this last winter.

From being conscious of it yesterday and holding myself straight on my ride I came back with no pain.