My mother has always had an intense fear of walking downhill. I never knew why until recently. In her 70s, shes fit, active and has a joy for life I hope I can match as I go through life. But walking downhill gives her the creeping willies. She clings to my father who holds her upright until they reach level ground. Even so, when I visited them in Arizona earlier this year, she gamely agreed to a steep trail hike up to see some Native American cliff dwellings, knowing full well there was only o....
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