What’s blood flow restriction training and why are Olympic athletes using it?

Quoted: “It’s almost like a personal tourniquet system. So you have a cuff that’s applied to your arm or leg that significantly reduces blood flow,” Marc Sherry, a physical therapist and manager of the UW Health Sports Rehabilitation Department in Madison, Wisconsin, told TODAY. “The basic premise is that it’s inflated to a pressure that prevents the blood from coming out of your arm but doesn’t prevent the blood from going into your arm.”