Alex Truman didn't think something was wrong until he returned to the gym. Before fathering his two kids, he worked out regularly and even made an early career of exercise. He had two degrees in health and fitness and ran gyms on the East Coast before he moved to Dallas and got into sales. Lean and square-jawed, he knew his body. But in his late 30s, it was betraying him. At 37, he was taking cholesterol medicine. "I didn't have an awful diet," he says, "but I liked beer, I liked pizza." He yearned to feel better.
He headed back to the weights and machines where he'd spent much of his 20s. He'd lift and lift, but something was different. Back in the day, all his effort would produce tangible results: bigger, defined muscles in his arms and legs, more strength and less fat. Now, results like that eluded him. "I'd go five to six days a week," Truman says, "and not see any progress." He'd go running and wear out easily. "It was really pissing me off because I had it before."