Ramp4x4 turns the proven Norwegian 4x4 protocol into one guided workout on iPhone and Apple Watch. V2 adds a clearer TRAIN flow, a complete 8-week plan, richer workout-quality analysis and Cardio Fitness trends, plus stronger phone–Watch reliability. Get live heart-rate targets, voice cues and haptics using Apple Watch, compatible Bluetooth HR monitors or Timer Only. Workout data stays on-device and in Apple Health.