Occlusion Training Bands - BFR Bands Classic Model, 2 Pack, Blood Flow Restriction Bands Help You Gain Muscle without Lifting Heavy Weights - Polypropylene Strap + Quick-Release Cam Buckle RESTRICTIVE BFR BANDS: Designed to offer superb restriction of blood flow through the working limb to the targeted muscles, the Blood Flow Restriction (BFR) bands reduce oxygen supply to the muscles in order to pre-fatigue slow twitch muscle fibers and diminish their response to workout loads, but to enable fast twitch muscle fibers to respond quickly to exercise training loads, resulting in faster lean muscle growth. INCREASED FACTORS FOR MUSCLE GROWTH: Studies show BFR training can increase muscle protein synthesis, NOS-1 expression and mTOR signaling, resulting in increased muscle growth. The studies also show BFR training can boost muscle growth and enhance potential for muscle gain by reducing Myostatin concentrations. QUICKER LEAN MUSCLES AND SUPERB TONE WITHOUT LIFTING HEAVY WEIGHTS: The Occlusion Training Bands  induce hypertrophy at very low loads (usually 10-30% of a 1RM). When applied to working limbs and paired with loads of 10-30% of a 1RM (lots of reps and very low rest until fatigue sets in), the results achieved are typically similar to those achieved with 80% 1RMs. Indeed, the Ischemic bands give lean muscles and amazing tone quickly and without heavy weight lifting. EXTRA-CONVENIENT AND SUPER-DURABLE BFR BANDS: Furnished with a very rigid strap and a quick-release cam buckle, the Classic BFR training bands are easy to strap up and effortless to release as soon as the exercise is completed. Each BFR Bands order comes with 2 bands to allow you to exercise both arms at the same time.