You can read the full story here: the real secret of Norwegian endurance….
2024-03-05 16:15:36 Have you ever thought about the mystery behind the remarkable endurance of Nordic athletes? This enigma intrigues many endurance enthusiasts. And no, the answer doesn’t lie in the freezing temperatures they endure back home. It is partly hidden in a intense and unique workout routineknown as 4×4 interval training. It is this secret … Read more