We head over to the treadmill. SEAL hands me two twenty-pound dumbbells and sets the controls. Incline: 8. Speed: 4.0. He pushes the start button. I do this for eight minutes. It’s like a brisk walk up a moderate-size hill carrying a couple of suitcases. Then, every minute thereafter, SEAL increases the incline by 1. By incline 10 it feels like I’m walking up a steep hill carrying two camp trucks; by 15, I’m climbing the side of a mountain holding two minivans!
