BFR using the Delfi Medical Innovations unit is a safe, FDA-approved, automated tourniquet system. Its operation is administered and monitored by a certified medical professional, such as a physical therapist, with a BFR certification. The safety for clinical use has been researched extensively, and the results are overwhelmingly positive. With a continuously monitored pneumatic unit that adjusts as you move and your muscles contract, risks of use are comparable to that of regular exercise.