At a petite 4 feet, 10 inches, Misty Posey couldn't rely on her height to clear the Marine Corps obstacle course as a prospective young recruit. Instead, she learned to pull her entire body over it, eventually developing a pull-up program now used across the service. Posey, who is now 49 and a commanding officer leading a Marine unit in California, didn't grow up lifting weights and avoided strength training until she was in her 30s for fear of bulking up . It was a worry, she told Business