The Science of Sweat:  Decoding HIIT (High Intensity Interval Training)

The Science of Sweat: Decoding HIIT (High Intensity Interval Training)

From The Living Life Well Show by Jon Skelton, MD

April 25, 2026 · 20 min

About this episode

Dr. Jon Skelton discusses the science behind HIIT training and how to optimize workouts using personal data and heart rate monitoring.

The Science of Sweat: Decoding HIIT (High Intensity Interval Training) Is your workout actually working? In this episode, Dr. Jhn Skelton breaks down the evidence-based framework for home-based HIIT training — combining smartwatch data with your body's own signals to help you train smarter, not just harder. What You'll Learn: What HIIT (High Intensity Interval Training) is and why it outperforms steady-state cardio for most goals How to calculate your personal target heart rate zones using the Karvonen (Heart Rate Reserve) Method The truth about Apple Watch accuracy during HIIT — what it does well and where it fails How to use the Rating of Perceived Exertion (RPE) scale to train by feel The 3 HIIT interval models (short, medium, long) and which is right for your fitness level Optimal work-to-rest ratios for running, swimming, and resistance/body weight training Why short bursts of intense activity can reduce cardiovascular mortality risk by up to 47% How to build a sustainable, injury-free HIIT routine Key Takeaways: Your heart rate zones are unique to YOU — base your training on where you are today Pair your smartwatch data with RPE for the most accurate self-assessment…

People in this episode

Host: Jon Skelton

Topics covered

  • HIIT
  • fitness
  • heart rate training
  • exercise
  • health

Keywords

  • HIIT
  • High Intensity Interval Training
  • heart rate zones
  • RPE scale
  • exercise assessment

Mentioned in this episode

Organizations: Apple Watch, ACSM, ESSA

Products: Polar H10 Chest Strap

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