Want a Stronger Heart? Try This.
- Jennifer Lee Hubl
- 3 days ago
- 1 min read
Want to improve your heart health, boost VO₂ max, and get more out of your cardio in less time?
In this video, I break down the Norwegian 4x4 Protocol — one of the most effective, science-backed interval training methods for improving cardiovascular fitness and longevity. As a cardiac sonographer and trainer, this is one of my favorite ways to help people strengthen their heart, improve endurance, and train with purpose.
❤️ What You’ll Learn:
✔️ What the Norwegian 4x4 protocol is
✔️ How to properly structure your intervals
✔️ What “high intensity” should actually feel like
✔️ Why this method improves VO₂ max and heart function
✔️ How to safely incorporate it into your routine
🔥 The Workout Structure:
• 4 minutes high intensity
• 3 minutes easy recovery
• Repeat for 4 rounds
👉 Simple. Efficient. Powerful.
📲 Train With Me Inside the App: If you want guided workouts using this style of training + full programs built for heart health:
🍏 Download Hubl Habit (Apple): https://apps.apple.com/us/app/hubl-habit/id6468809571
🤖 Download Hubl Habit (Google Play): https://play.google.com/store/apps/details?id=com.leanondigital.hublhabit&hl=en_US
🧬 My Supplement Recommendations (25% Off with code HUBLHABIT): Support your heart, recovery, and performance:
Why This Matters Your VO₂ max is one of the strongest predictors of longevity and cardiovascular health. This type of structured interval training helps you:
✔️ Strengthen your heart muscle
✔️ Improve oxygen efficiency
✔️ Support blood pressure and metabolic health
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