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Most workouts labeled “HIIT” are really just hard interval circuits and that one mix-up can be the reason you feel exhausted but don’t see the fat loss, power, or muscle definition you were promised. We get specific about what high intensity interval training actually is: near maximal cardiovascular effort with recovery that’s long enough to repeat that same max effort again. If you can’t reproduce your output, it’s a sign your rest is too short or your intensity isn’t truly high. 

We are joined by Heather Flebbe, an exercise physiologist, a local studio owner at FitFix, and college professor, to cut through misinformation with simple, practical exercise science. We talk about why real HIIT recruits fast twitch muscle fibers, how it supports performance and muscle definition, and why the metabolism boost (EPOC or the afterburn) depends on how close you get to peak intensity. Heather also shares a clear guideline for frequency: one to two HIIT sessions per week, plus the recovery habits that make those sessions count, including hydration with electrolytes and refueling with carbohydrates and protein. 

We also dig into programming details most people never hear, like work-to-rest ratios that can range from 1:2 to 1:8 depending on interval length, and why longer rest can actually create better training results. You’ll learn how to use waking resting heart rate to gauge recovery, why recovery heart rate is a meaningful marker for longevity, and how training your body to spike stress and return to baseline is part of becoming more resilient. And yes, we address the cortisol fear head-on with a science-based perspective that puts context back into the conversation. 

If this helped you rethink your HIIT training, subscribe to Words of Wellness, share it with a friend who loves “HIIT” classes, and leave a rating and review so more people can find accurate, usable wellness guidance.

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In Health, 

Shelly