The Norwegian 4×4 Workout – How 4 Intervals Can Improve Your Cardio Fitness
Time is the biggest obstacle stopping you to have a consistent cardio. Between work, family and everyday responsibilities, carving out an hour for a run can feel impossible. The good news is that long, steady workouts aren’t the only way to build real endurance. The Norwegian 4×4 is a research-backed interval training method that condenses … Read more