Knees and Butter

I've been a runner for decades, fully aware that the pounding was probably destroying my knees. A recent article in the Times says that to the contrary, this longtime conventional wisdom is wrong. Studies have found runners' knees are stronger than those of non-runners, and less susceptible to injury. The same issue of the Times had an article saying that – contrary to previous assumptions – weight training was good for the arms of those who'd had mastectomies, not bad for them. This...