I have been doing kaatsu, now called blood flow restricted, training for 20 years, initially with a thigh blood pressure cuff for the legs. When I got an opportunity to look for a better option, the EDGE system popped up. I bought one and subsequently another. They are well-fitting, easy-applying, air-holding units that make BFR almost but not quite a joy, if not for the client, at least for me, the trainer.