Fifty minutes into a training session at a gym in lower Manhattan, I’m doing burpees and clean-and-jerks while Beyond Meat CEO Ethan Brown—all 6 feet, 5 inches of him—is bear-crawling into pushups, then slamming a medicine ball to the ground from overhead.

I was lured to this TMPL gym off Astor Place because Brown is a lifelong fitness nut, and he’d shoehorned this workout in on Monday morning between arriving from L.A. the night before and departing........

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