These blood flow restriction bands reduce the supply of oxygen to the muscles to pre-fatigue slow muscle fibers and reduce their response to exercise loads. INCREASED FACTORS FOR MUSCLE GROWTH: Studies show that exercise can increase muscle protein synthesis, expression of NOS-1 and mTOR signaling, leading to increased muscle growth. The studies also show how tourniquets can be used in exercise to increase muscle growth and improve muscle growth potential by reducing myostatin levels. FASTER LARN MUSCLES AND EXCELLENT TONE WITHOUT LIFTING HEAVY WEIGHTS: Occlusion training bands cause very low load hypertrophy (usually 10-30 percent of 1RM). When applied to working legs and combined with loads of 10-30 percent of 1RM (lots of reps and very low rest before fatigue sets in), the results are usually close to those obtained with 80 percent 1RMs. In fact, the ischemic bands easily and without heavy weight lifting offer lean muscle and great sound. EXTRA STRONG AND SUPER-COMFORTABLE BANDS: The Pro Package training straps are easy to secure, easy to remove as soon as the training is complete and incredibly comfortable on the work leg. Per Package, order comes with 4 tourniquets for occlusion. If you use the bicep strap or thigh strap, it retains its shape and elasticity.