- iOS App Store
- Paid
- Nikita Yampolski
- Health & Fitness, Sports
Release Date: May 2024Last Update On: June 2026
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 i...