NTRVL: Norwegian 4x4 Trainer

By Andrii Gryshutkin on AppTrack Ninja.

VO2 Max Interval Timer + HR

Your first session is eight minutes. Two minutes of warm-up, one four-minute interval, two minutes to cool down. Long enough to feel what zone 4 is, short enough that you actually finish it. The full Norwegian 4x4 is there when you want it: four hard four-minute intervals with three easy minutes between them, the protocol from Helgerud et al., 2007. NTRVL counts every phase, tells you when to push and when to ease off, and saves the session to Apple Health. HEART RATE, HOWEVER YOU HAVE IT - Apple Watch: start on your wrist and leave the phone at home - AirPods Pro 3 or Powerbeats Pro 2: train…

Categories: Health & Fitness, Lifestyle

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