Nice work MLCM. You've passed the 'listen to you body' test with flying colours. Very smart and not always easy.
I do a fair amount of cycling but it could just exacerbate the problem. One thing I am sure of is my flexibility is woeful. From my hips down to my ankles. Hell, I can barely turn my kneck.
I need to sell the house and move to an ashram and get seriously bendy.