I’d see her welcoming the dawn each day. She was our local power walker. As I drove my kids to school, she’d be there on the road’s shoulder. Equipped with an oversized pair of headphones and knee-high, colorful socks, she walked with an alternating movement of arms and feet, always with one foot in contact with the ground. The sport is different from running or jogging. Power walking involves an intentional restraint, a reining in of the body’s natural inclination to run. Although it doesn’t look like it, there’s just as much energy, focus, and power involved as in running…