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CALVIN MCDONALD IS on his bike, indoors, on this early Monday morning, alternately putting his head down and eyeing the iPad that’s serving up his Zwift virtual-ride course. He’s tackling three epic climbs in nearly 30 miles. The cumulative 3,000 feet of elevation gain isn’t for the faint of heart or the tired of legs, but McDonald doesn’t mind. He’s all in with his virtual training buddies, who deliver a mix of support and typical bike-pack trash talk to grind through the pain. The workout ends with a merciful four-mile downhill.
After that, the 51-year-old