Norwegian 4x4

Norwegian 4x4 Protocol Training App The Norwegian 4x4 Protocol is a cutting-edge approach to exercise that can significantly boost your cardiovascular health and stamina. It consists of four intense four-minute intervals at 90-95% of your maximum heart rate, each followed by a three-minute recovery period. This scientifically backed method is renowned for its efficiency in improving VO2 max and overall endurance. Whether you're an athlete or a fitness enthusiast, this protocol will take your performance to new heights.