Business Unusual: Operation Muffintop Former Navy SEAL Randy Hetrick stitched together a gizmo that turned into a $20 million business.

Of all the testosterone-fueled lessons Randy Hetrick learned as a super-buff Navy SEAL, the one that launched him into the business world was this: Sewing.

Frogmen, he says, learned to stitch so they could modify standard-issue gear for clandestine missions. So about 20 years ago, when Hetrick was in Southeast Asia and looking for a way to train, he stitched parachute webbing into straps that he could fasten to a door and use as a pulley device. He got a workout similar to weightlifting, but instead of pumping iron, he was using his own body weight as resistance.