1. Four - piece set: Our brand - new professional straps are now available in a set, which includes two leg straps (2 inches wide and 40 inches long) and two arm straps (2 inches wide and 26 inches long), along with a carrying bag. It is a complete set of blood flow restriction training equipment. These straps are designed to achieve excellent blood flow restriction effects on the target muscles by acting on the moving limbs. These blood flow restriction straps will reduce the oxygen supply to the muscles, make the slow - twitch muscle fibers fatigue earlier, and reduce their response to the training load. 2. Promotion of factors for muscle growth: Research shows that training with these straps can increase muscle protein synthesis, the expression of nitric oxide synthase - 1 (NOS - 1), and mammalian target of rapamycin (mTOR) signaling, thereby promoting muscle growth. Studies also indicate that using the straps during training can promote muscle growth by reducing the level of myostatin and enhance the potential for muscle growth. 3. Rapidly build lean muscles and achieve excellent muscle lines without heavy lifting: These blood flow restriction training straps can achieve low - load muscle hypertrophy (usually 10 - 30% of one - repetition maximum). When applied to the moving limbs and combined with a load of 10 - 30% of one - repetition maximum (multiple repetitions with short rests before exhaustion) for training, the training effect is usually similar to that of training with a load of 80% of one - repetition maximum. In fact, these ischemic straps can easily help build lean muscles and present amazing muscle lines without high - intensity weight - bearing training. 4. Super - strong and ultra - comfortable straps: The professional set of training straps is equipped with super - elastic straps, quick - release buckles, and elastic loops for fixing the excess parts. They are easy to fix and can be easily removed after training. They are also very comfortable to use on the moving limbs. Each order includes four straps for blood flow restriction training. Whether using the bicep straps or the thigh straps, they can maintain their shape and elasticity.