Peak Intervals: Norwegian 4x4 — ASO

By Justin Polidori on AppTrack Ninja.

VO2 Max & Zone 2 Training

Peak Intervals guides two endurance workouts with Apple Watch or a Bluetooth heart rate monitor: the Norwegian 4x4 to train your VO₂ max, and steady Zone 2 sessions to build your aerobic base. It shows how each session went. Guided workouts need Apple Watch or a Bluetooth heart rate monitor, and a Peak Intervals Pro subscription, with a 2-week free trial where available. History, Trends and the analysis of your Apple Health workouts are free. NORWEGIAN 4x4 • Four 4-minute intervals at 90–95% of your max heart rate, with 3-minute recoveries. • Live guidance keeps you in the zone: haptic cues o…

Categories: Health & Fitness

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