BUNDLE PACK OF 4: Our new PRO Bands come in a 2 LEG BUNDLE measuring 2"W x 40"L and 2 ARM bands measuring 2"W x 26"L, complete with a carry bag, making it a perfect set for occlusion training. They are designed to provide excellent blood flow restriction to the targeted muscles through the working limb. These Blood Flow Restriction bands limit oxygen supply to the muscles to pre-fatigue slow-twitch muscle fibers and diminish their response to workout loads. INCREASED MUSCLE GROWTH POTENTIAL: Research indicates that training can enhance muscle protein synthesis, increase NOS-1 expression, and activate mTOR signaling, leading to greater muscle growth. Studies also reveal how tourniquets can be implemented in training to amplify muscle growth and improve muscle gain potential by lowering myostatin levels. FASTER LEAN MUSCLES AND GREAT TONE WITHOUT HEAVY WEIGHT LIFTING: The Occlusion Training Bands induce very low load hypertrophy (generally 10-30 percent of 1RM). When applied to working limbs and combined with loads of 10-30 percent of 1RM (high repetitions with minimal rest until exhaustion), results are typically similar to those achieved with 80 percent 1RMs. The Ischemic bands provide lean muscles and impressive tone without the need for heavy lifting. EXTRA-STRONG AND SUPER-COMFORTABLE BANDS: Equipped with an extra-strong elastic harness, a quick release buckle, and an elastic loop to keep excess slack in place, the PRO Package training bands are simple to secure, easy to remove once the exercise is finished, and extremely comfortable on the working limb. The package includes 4 tourniquets for occlusion. Whether using the bicep strap or the thigh band, it will maintain its shape and elasticity.