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Why Filet Mignon Is So Tender—and What That Tells Us About the Human Psoas
Filet mignon is prized for being the most tender cut of beef—but why? In this episode of What I’m Reading, What I’m Thinking, we dive into the anatomy of the cow’s psoas major muscle (aka the tenderloin) and explore why its underuse makes it so soft. Then, we connect the dots to the human psoas—an often misunderstood muscle that’s more stabilizer than mover.
I share how the human psoas differs from the iliacus, why it's not just a hip flexor, and how it works synergistically with the quadratus lumborum. We also talk about its role in posture, pressure regulation, and the fascial system—and why this deep, internal muscle deserves more attention in both movement and bodywork.
📘 This episode draws from research used in writing my upcoming book where fascia, fluid dynamics, structural, and function come together.
Watch on YouTube:
https://youtu.be/8hYenQ25-ws
Listen on
Apple: https://apple.co/3YX2O5b
Spotify: https://open.spotify.com/show/1OEkzrbqnyCFFhSHydZmTP?si=Z8L_fiZgRHua3QhxBWpsig
I use Descript because it drastically speeds up my editing process—it's the only way I can consistently create content with my busy schedule. If you want to try it for yourself, sign up using my affiliate link: https://get.descript.com/f7tn5mo5dzn7
Research
- Bogduk & Pearcy (1995) – The psoas major muscle: A review
Clinical Anatomy, 8(5), 339–346
https://onlinelibrary.wiley.com/doi/abs/10.1002/ca.980080506 - Neumann, D. A. (2017) – Kinesiology of the Musculoskeletal System
Elsevier
https://www.elsevier.com/books/kinesiology-of-the-musculoskeletal-system/neumann/978-0-323-28753-0
Amazon: https://www.amazon.com/dp/0323287530 - Andersson et al. (1995) – The role of the psoas and iliacus muscles for stability and movement
Scandinavian Journal of Medicine & Science in Sports
https://pubmed.ncbi.nlm.nih.gov/7552754/ - Willard et al. (2012) – The thoracolumbar fascia: anatomy, function and clinical considerations
Journal of Anatomy
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3507045/
• 5. Hodges & Gandevia (2000) – Activation of the human diaphragm during postural tasks
Journal of Physiology
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2270004/
View all episodes
By Isaac OsborneFilet mignon is prized for being the most tender cut of beef—but why? In this episode of What I’m Reading, What I’m Thinking, we dive into the anatomy of the cow’s psoas major muscle (aka the tenderloin) and explore why its underuse makes it so soft. Then, we connect the dots to the human psoas—an often misunderstood muscle that’s more stabilizer than mover.
I share how the human psoas differs from the iliacus, why it's not just a hip flexor, and how it works synergistically with the quadratus lumborum. We also talk about its role in posture, pressure regulation, and the fascial system—and why this deep, internal muscle deserves more attention in both movement and bodywork.
📘 This episode draws from research used in writing my upcoming book where fascia, fluid dynamics, structural, and function come together.
Watch on YouTube:
https://youtu.be/8hYenQ25-ws
Listen on
Apple: https://apple.co/3YX2O5b
Spotify: https://open.spotify.com/show/1OEkzrbqnyCFFhSHydZmTP?si=Z8L_fiZgRHua3QhxBWpsig
I use Descript because it drastically speeds up my editing process—it's the only way I can consistently create content with my busy schedule. If you want to try it for yourself, sign up using my affiliate link: https://get.descript.com/f7tn5mo5dzn7
Research
- Bogduk & Pearcy (1995) – The psoas major muscle: A review
Clinical Anatomy, 8(5), 339–346
https://onlinelibrary.wiley.com/doi/abs/10.1002/ca.980080506 - Neumann, D. A. (2017) – Kinesiology of the Musculoskeletal System
Elsevier
https://www.elsevier.com/books/kinesiology-of-the-musculoskeletal-system/neumann/978-0-323-28753-0
Amazon: https://www.amazon.com/dp/0323287530 - Andersson et al. (1995) – The role of the psoas and iliacus muscles for stability and movement
Scandinavian Journal of Medicine & Science in Sports
https://pubmed.ncbi.nlm.nih.gov/7552754/ - Willard et al. (2012) – The thoracolumbar fascia: anatomy, function and clinical considerations
Journal of Anatomy
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3507045/
• 5. Hodges & Gandevia (2000) – Activation of the human diaphragm during postural tasks
Journal of Physiology
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2270004/