Courtesy Gutman; Taryn Colbert, MH Illustration

I HAVE ALWAYS envied the chiseled bodies of the models, bodybuilders, and celebrities I’ve profiled as a fitness writer. But looking like a beautiful statue-person is a 24/7 chore, and pizza tastes damn good. Then, sometime after learning my wife was pregnant, and amid my attempt to bring order to every crevice of my life, I was offered a chance to try a new training program from Men's Health : 28-Day Belly Fat Burner. I followed the plan for four weeks and ultimately shed 13 pounds and lost three inches from my waist. It was packed with science-backed tips for getting lean, plus a 28-day workout plan.…