It’s 6:45 a.m. and cold — in the mid-30s — when I step onto the Bethesda-Chevy Chase YMCA’s outdoor pool deck, a towel wrapped around my shoulders. Pink streaks punctuate the sky, and I can still see ...

When most of us think of exercising, images of long runs on the treadmill or picking up heavy weights often come to mind. But although these are both great ways of keeping fit, they aren’t for ...