For Saugus-born snowboarder Jonathan Cheever, there is no off-season. And while that sounds a lot like a Gatorade tagline, Cheever’s balancing act of professional snowboardcross competition and plunging pipes as a plumber—the former a career driven by passion, pragmatism, and a set of Olympian abs that would make even Hugh Jackman blush—is a necessary lifestyle, not a marketing campaign.