Norwegian 4x4 Hiit Timer - Interval Training & VO2 Max App Boost VO2 MAX With Norwegian 4X4 Protocol Workouts Transform your fitness with the proven Norwegian 4x4 interval training method - the most effective Hiit workout for maximising cardiovascular performance and endurance gains. KEY Features: - 4x4 Timer - Precision 4min work / 3min rest cycles - Heart Rate Training - Track 90-95% max HR zones - VO2 Max Improvement - Scientifically proven results - Hiit Interval Timer - Multiple workout protocols - Progress Tracking - Monitor your fitness transformation - Universal - Running, cycling, rowing, any cardio, you name it -…
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