This app guides you through the Norwegian 4x4 interval workout using your real heart rate. It provides spoken cues and target heart rate ranges to ensure you train at the correct intensity without needing to constantly check your screen.




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This app guides you through the Norwegian 4x4 interval workout using your real heart rate. It provides spoken cues and target heart rate ranges to ensure you train at the correct intensity without needing to constantly check your screen.





This interval training app guides you through the Norwegian 4x4 protocol or allows you to create custom workout routines. It offers audio cues, haptic feedback, and music integration to enhance your training sessions. Track your progress with workout history and unlock achievements.


This app guides you through the Norwegian 4x4 VO2max interval training protocol using your Bluetooth heart rate monitor. It provides real-time audio cues to keep you in your target heart rate zones during work and rest intervals.