Dr. Stacy Sims: Why Your 45-Minute HIIT Class Is Wasting Your Time (Do This Instead)

Most HIIT programs leave you exhausted for a reason: they are not actually HIIT. In this clip, Dr. Stacy Sims breaks down why your 45-minute "high intensity" class may be creating catabolic stress instead of real physiological adaptation, and explains the exact protocol for true HIIT that takes 25 minutes or less. If you have been training hard with inconsistent results, the problem is not your effort. It is the type of stimulus you are applying. The Gabby Reece Show This is where I have real conversations with the people I find most worth listening to: scientists, athletes, coaches, parents, and thinkers who are doing the hard work of building a life that holds up over time. No hacks. No quick fixes. Just honest, practical conversations about performance, longevity, relationships, and what it actually takes to show up well at every age. If you are here, you probably already know that health is not a destination. It is how you live. I am glad you are along for it. Connect with Gabby Reece: Instagram:   / gabbyreece   TikTok:   / gabbyreeceofficial   Website: https://gabriellereece.com