“’It always under-promises and over-delivers,’ Hetrick says. ‘It’s just a set of straps. But it’ll move any way the body wants it to move. I’ve gotten stronger than when I was 15 years younger. You’re better able to manage your body in an unstable circumstance, which is just like sports. Think about it. I can crush the most elite MMA fighter on earth with these silly straps. And your wife likes it, too.’” TRX Inventor and CEO Randy Hetrick on SI.com’s Edge.