apps / 6499464775
Norwegian 4x4 Protocol
Nikita Yampolski · Health & Fitness · $5.99 · US storefront
- rating
- 4.4 ★
- ratings
- 49
- updated
- Jun 10, 2026
- released
- May 1, 2024
v2.5
visible word pool · 3 words
title 22/30 chars · subtitle unavailable
App Store search indexes the title and subtitle together with the hidden 100-character keyword field as one combined pool: any phrase assembled from those words can rank. These are the words of Norwegian 4x4 Protocol's pool that are public — the keyword field is not exposed by any API.
from the listing
Norwegian 4x4 HIIT Timer — Interval Training & VO2 Max BOOST VO2 MAX WITH NORWEGIAN 4X4 PROTOCOL WORKOUTS Train smarter with the Norwegian 4x4 protocol, one of the most studied HIIT methods for improving cardiovascular performance and endurance. A precise, distraction-free timer guides every interval so you can focus on the effort. KEY FEATURES: - Norwegian 4x4 Timer - Precision 4min work / 3min rest cycles - Heart Rate Training - Track 90-95% max HR zones - VO2 Max…
latest US reviews
★★★★★
No Details
This app is essentially a timer, there is no guided instruction, which is difficult as a beginner. Also, when the app went in the background, it closed and kept starting over again during my workout. Do not recommend.
— ErnLantry
★★★★★
Meh
I see why a trial period was not an option, I wouldn’t have purchased. I was expecting a linkage to target heart rates and the Apple Watch pulse reading.
— thpitt
★★★★★
User
It has the right times, but no tracking history and goes out when have to use your electronic for either a phone call or email etc
— lacypoo
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