It starts sometime after you hit 30: you get out of bed one morning and your back feels like a stiff branch and your knees are more creaky than they’ve ever been. For at least a few seconds, you take slow steps, one by one, until your body loosens up and feels no pain, like it normally felt when you were a younger person. That morning, when you got out of bed, you realized that the hill you’ve been climbing [...]















