I do love it when great new blogs show up in my referrer list.
The latest of these has the wonderful title of Laughing~Knees which has the following explanation:
"Laughing~Knees" is so named from the condition that mountain walkers get when descending for a long time. With fatigue the knees begin quivering with each step. In Japan walkers proclaim, "Hiza ga waratteru!" ( My knees are laughing! ).
Wonderful - I'll try to remember that next time!