I’m following Keith McKeever and his friends up a mountain-bike trail on a bright summer afternoon. The trail climbs smoothly but unrelentingly as it switchbacks up the side of Winch Mountain in Wilmington.
I’m feeling good at first, legs spinning, tires grabbing the soil. But after a few minutes I start to feel an ache in my chest, my breathing gets more labored, and my speed falters. Soon I come to a stop. Sweat drips off my forehead as I hunch over the handlebars and re-oxygenate my lungs.
Keith looks back as he turns up the next switchback. “Nice job!” he yells. “You’re almost halfway up.” Then he disappears around the bend. » Continue Reading.