Wingates can be helpful. “If you’ve never done the Wingate-cycle test, let me try to explain what it feels like,” A. J. Jacobs wrote in his Esquire article about interval training. “It feels like your legs are giving birth. It feels like you’ve got an eight-martini hangover in your calves. Your face contorts like a porn star in an AVN-award-winning threesome scene. You emit noises that resemble feedback at a thrash-metal concert. . . . The upside: It’s over in 30 seconds.” Jacobs is exaggerating just a little about how painful Wingates are. But his greater point is sound. You’re supposed to
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