Pick any hiking trail in any part of the country on a summer weekend afternoon and you’ll find people of every size, shape, age, and ability. You might spot a middle-age couple speeding along at three miles per hour, effortlessly carrying on a conversation as they clamber over logs and sprint up switchbacks. Behind them is a troop of kids, moving slowly as they search the forest floor for nature’s shiniest pebbles and smoothest sticks as several fleece-wearing parents and zigzagging dogs herd them forward. And finally there might be a former athlete trying to reclaim the vigor of his younger days as he huffs and puffs to reach the top of the next hill. When he gets there, he stops and enjoys the view as he catches his breath and ...

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