The days of heavy lifting are gone. Build muscle more effectively with the Bfr Bands Pro Bundle 4-Pack.Blood flow restriction training with resistance helps improve muscular size, power, and strength at low training volumes and intensities. Use these blood flow restricting bands to maximize your fitness, support gains, and restrict blood flow without the use of heavy weights or harmful man-made products. Great for building arm, leg, and glute muscles, these occlusion training bands feature a slack-proof elastic loop and easy-locking buckle letting you adjust the tightness to your fitness level. Use the band numbers to track pressure and ensure symmetry while you exercise. Offering moderate pressure, this workout equipment works for beginner and intermediate fitness levels. The Pro bundle 4-pack includes 2 Pro Slim bands, 2 Pro Bfr bands, and free training e-book.