If you only have a few hours a week to train, how much should you spend on Zone 2? Exercise scientist Dr. Martin Gibala joins Ben Pakulski to explain what the evidence supports for improving cardiovascular fitness when time is limited.

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Elite endurance athletes often spend most of their training time at lower intensities. But does their 80/20 split make sense for someone training two hours a week? Gibala explains why that recommendation deserves a closer look, and how to think about intensity beyond the zones on your watch.

In this episode, you'll learn:

Why 3 to 5 minute intervals are a strong option for improving VO₂ max.
What "vigorous" effort actually feels like, using a simple 1 to 10 scale.
Where exercise snacks showed blood sugar benefits, and why at-home trials didn't reproduce the fitness gains seen in the lab.
How short sprints and longer intervals create different training demands.
What to consider about cardio, muscle retention and GLP-1 medications.

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About Dr. Martin Gibala

Dr. Gibala is a professor of kinesiology at McMaster University, author of The One-Minute Workout, and co-host of the Exercise Science podcast with Dr. Stuart Phillips.

Chapters

00:00 Dr. Gibala's Path Into Exercise Science

13:09 Exercise Snacks and the One-Minute Workout

23:51 How Exercise Scientists Measure Fitness

34:45 How Hard Is Vigorous? The 1 to 10 Scale

38:18 Intervals for Improving VO₂ Max

43:21 Training Zones and Metabolic Thresholds

53:35 Does the 80/20 Split Fit Your Schedule?

59:54 Cardio, Muscle and GLP-1s

1:08:08 Where to Find Dr. Gibala

Connect with Dr. Martin Gibala

Website: www.martingibala.com

Instagram: https://www.instagram.com/gibalamj/

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The Exercise Science Podcast:

Website: www.realexercisescience.com

Spotify: https://open.spotify.com/show/29lBGiRrOMSaN5cjy4e1vK?si=4cf6c9ad47ea4415

Apple Podcasts: https://podcasts.apple.com/us/podcast/exercise-science/id1885632210

YouTube: https://www.youtube.com/@realexercisescience

Facebook: https://www.facebook.com/realexercisescience/

TikTok: https://www.tiktok.com/@realexercisescience

Instagram: https://www.instagram.com/realexercisescience/

Threads: https://www.threads.com/@realexercisescience

X: https://x.com/realexscience

BlueSky: https://bsky.app/profile/realexscience.bsky.social

Connect with Ben

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