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Unit 42

Comments for The Blog of Author Tim Ferriss

What I'd Add To The 4-Hour Workweek for 2015 (And Much More) (#49 & #51, plus bonus episode #44) - The Blog of Author Tim Ferriss The “Divine Leaf” with 8,000+ Years of Use — Exploring the Many Benefits of Coca with Dr. Andrew Weil and Wade Davis (#871) - The Blog of Author Tim Ferriss Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future - The Blog of Author Tim Ferriss Comment on Pavel: 80/20 Powerlifting and How to Add 110+ Pounds to Your Lifts by Merlin Death by 1,000 Compromises: How to Tap Into Founder Mode - The Blog of Author Tim Ferriss Comment on Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future by David Kadavy Where Are You Still Using Single-Ply? How to Lose 100 Pounds on The Slow-Carb Diet – Real Pics and Stories Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future - The Blog of Author Tim Ferriss Max Levchin, PayPal and Affirm — The Path from The Soviet Union to Building Multi-Billion Dollar Companies (Plus: Real-World Socialism vs. Capitalism) (#869) - The Blog of Author Tim Ferriss Tim’s Founder Kitchen — From Brainstorm to the President’s Office in Two Months (Featuring Jake Becraft, Strand Therapeutics) (#868) - The Blog of Author Tim Ferriss On The Importance of Desperate Customers - The Blog of Author Tim Ferriss Sami Inkinen of Virta Health — Reversing Type 2 Diabetes, Rowing 2,750 Miles, and Lessons from Fixing Metabolic Health in 100,000+ People (#866) - The Blog of Author Tim Ferriss The Practice of Self-Inquiry: 10 Questions for People Who Are Too Hard on Themselves The Tim Ferriss Show Transcripts: The Random Show, Couch Edition! — Supplements, Hummingbirds, Cock Rings, Optimizing Mitochondria, Breathing and Balance Training, Cool Grip-Strength Tools, and More (#858) How I Beat Lyme Disease with The Ketogenic Diet — Science, How-To Protocols, and 10+ Years of Zero Symptoms The Tim Ferriss Show Transcripts: Dr. Michael Levin — Reprogramming Bioelectricity, Updating “Software” for Anti-Aging, Treating Cancer Without Drugs, Cognition of Cells, and Much More (#849) Notes on Being a Man, and Advice for Young Men Who Are Feeling Lost — Scott Galloway The Tim Ferriss Show Transcripts: Dr. Becky Kennedy — Parenting Strategies for Raising Resilient Kids, Plus Word-for-Word Scripts for Repairing Relationships, Setting Boundaries, and More (#784) Sam Corcos, Co-Founder of Levels — The Ultimate Guide to Virtual Assistants, 10x Delegation, and Winning Freedom by Letting Go (Plus: Creating Leverage with Tools, Systems, and Processes) (#694) What My Morning Journal Looks Like The Value of Aggression — Ode to Dan Gable Real Mind Control: The 21-Day No-Complaint Experiment
Dr. Keith Baar, UC Davis — Simple Exercises That Can Repair Tendons (Tennis Elbow, etc.), Collagen Fact vs. Fiction, Isometrics vs. Eccentrics, JAK Inhibitors, Growth Hormone vs. IGF-1, The Anti-RICE Protocol, and How to Use Load as an Anti-Inflammatory (#797) - The Blog of Author Tim Ferriss
Tim Ferriss, Paul · 2026-06-20 · via Comments for The Blog of Author Tim Ferriss

Dr. Keith Baar is a professor at the University of California, Davis, in the Department of Physiology and Membrane Biology.

During his PhD studies, his research revealed that mechanical strain on muscle fibers activates the mammalian target of rapamycin (mTOR) signaling pathway, a crucial regulator of muscular hypertrophy. 

Subsequently, he studied the molecular dynamics of skeletal muscle adaptation to endurance training under the guidance of Dr. John Holloszy, a legend in the field of exercise physiology, considered the father of modern exercise biochemistry.

Building on all of this experience, he conducted research into tendon health and the potential for engineering ligaments, which could have implications for treatment and recovery from injuries.

Dr. Baar now runs the Functional Molecular Biology Lab at UC Davis. His lab’s work ranges from studying molecular changes in our cells to conducting studies to effect real-world improvements in people’s health, longevity, and quality of life.

Please enjoy!

Listen to the episode on Apple PodcastsSpotifyOvercastPodcast AddictPocket CastsCastboxYouTube MusicAmazon MusicAudible, or on your favorite podcast platform. The transcript of this episode can be found here. Transcripts of all episodes can be found here.

This episode is brought to you by Cresset prestigious family office for CEOs, founders, and entrepreneurs; AG1 all-in-one nutritional supplement; and Shopify global commerce platform, providing tools to start, grow, market, and manage a retail business.

Dr. Keith Baar, UC Davis — Simple Exercises That Can Repair Tendons (Tennis Elbow, etc.), Collagen Fact vs. Fiction, Isometrics vs. Eccentrics, JAK Inhibitors, Growth Hormone vs. IGF-1, The Anti-RICE Protocol, and How to Use Load as an Anti-Inflammatory

This episode is brought to you by Cresset Family Office! Cresset offers family office services for CEOs, founders, and entrepreneurs. They handle the complex financial planning, uncertain tax strategies, timely exit planning, bill pay and wires, and all the other parts of wealth management that would otherwise pull me away from doing what I love most: making things, mastering skills, and spending time with the people I care about. Schedule a call today at cressetcapital.com/Tim to see how Cresset can help streamline your financial plans and grow your wealth.

I’m a client of Cresset. There are no material conflicts other than this paid testimonial. All investing involves risk, including loss of principal.


This episode is brought to you by ShopifyShopify is one of my favorite platforms and one of my favorite companies. Shopify is designed for anyone to sell anywhere, giving entrepreneurs the resources once reserved for big business. In no time flat, you can have a great-looking online store that brings your ideas to life, and you can have the tools to manage your day-to-day and drive sales. Go to Shopify.com/Tim to sign up for a one-dollar-per-month trial period. It’s a great deal for a great service, so I encourage you to check it out. Take your business to the next level today by visiting Shopify.com/Tim.


This episode is brought to you by AG1. I’ve taken AG1 for more than a decade. Longtime listeners have heard me call it my nutritional insurance. Here’s the news: they’ve just launched AG1 Pro, designed for people focused on performance and longevity. I’ll be traveling soon, and I’m throwing this in my bag to cover my bases while I travel. Past a certain age, maintaining lean muscle becomes priority number one, and AG1 Pro is formulated to support exactly that. It includes HMB, a clinically studied compound that supports protein synthesis and helps reduce protein breakdown, plus zinc carnosine to support the gut lining. Remember: training is only half the equation. Recovery is where the work compounds, and AG1 Pro is built to support it. It’s NSF Certified for Sport, so what’s on the label is what’s in the pouch. Get your free AG1 Pro Yeti Shaker in the Welcome Kit at Drinkag1.com/Tim.


Want to hear another episode that explores the possibilities of rapamycin? Have a listen to the conversation I had with Peter Attia, David M. Sabatini, and Navdeep S. Chandel at the source of this miraculous compound: Easter Island. Here, we discuss how one of the most important discoveries of medical science was almost lost, why metabolism (along with longevity) research is key to treating a long list of diseases, intermittent dosing of rapamycin, parenting advice from scientists on confidence and conflict, the necessary failures of good science, good fonts versus bad fonts, “non-potato” relationships, and much more.


What was your favorite quote or lesson from this episode? Please let me know in the comments.

SELECTED LINKS FROM THE EPISODE

  • Connect with Dr. Keith Baar:

Website | Bluesky | LinkedIn

The transcript of this episode can be found here. Transcripts of all episodes can be found here.

Physiology & Biology
Strength Physiology

Molecular Biology

Exercise Physiology

Injury & Recovery

Training & Rehabilitation Methods

Substances & Interventions

Supplements

Pharmaceuticals

Orthobiologics (Critiqued)

Diets

Institutions & Places

Movies

Research

Relevant Resources

SHOW NOTES

  • [00:07:12] How I discovered Keith’s work through a tweet about tennis elbow and rock climbing.
  • [00:07:54] Emil Abrahamsson’s hangboard training protocol.
  • [00:09:20] The fundamental principles of strength training and connective tissue adaptation.
  • [00:10:36] mTOR complex 1 and its role in muscle growth.
  • [00:12:06] Engineered ligaments and the discovery of minimal effective doses for tendon adaptation.
  • [00:13:50] The refractory period between optimal tendon loading sessions.
  • [00:16:42] Rapamycin’s effects on muscle hypertrophy.
  • [00:18:49] Protocols for tennis elbow rehabilitation.
  • [00:20:28] Why isometrics work better than eccentrics for tendon healing.
  • [00:22:14] Stress shielding and how load distribution affects tendon healing.
  • [00:29:07] The misconception about eccentric loading for tendon injuries and why velocity matters.
  • [00:29:58] Ideal duration for isometric holds (10-30 seconds) based on injury status.
  • [00:33:50] My elbow issues and current rehab approach.
  • [00:36:02] Overcoming vs. yielding isometrics and optimal loading strategies.
  • [00:47:11] Dr. Barr’s movement prescription for my tennis elbow.
  • [00:52:18] Loading timing post-surgery and RICE protocol criticism.
  • [00:56:58] Achilles tendon rehabilitation after surgery.
  • [01:00:18] Critique of orthopedic suturing techniques and recommendation for resorbable sutures.
  • [01:04:02] Multiple position isometrics for tennis elbow rehabilitation.
  • [01:07:26] Collagen synthesis, supplementation, and vitamin C timing.
  • [01:12:59] Critique of BPC-157 and other injectable peptides for tendon healing.
  • [01:18:19] Evaluation of orthobiologics’ (PRP, prolotherapy, stem cells) effectiveness.
  • [01:21:37] JAK-STAT inhibitor drugs and their effects on tendon growth.
  • [01:25:35] Drugs that increase risk of tendon ruptures (fluoroquinolones, AT-1 receptor drugs).
  • [01:29:33] How estrogen affects tendon stiffness and injury risk in women.
  • [01:32:48] Testosterone’s opposite effects on tendon compared to estrogen.
  • [01:35:31] Protein intake recommendations and timing.
  • [01:40:11] Ketogenic diet effects on mitochondrial biogenesis and longevity.
  • [01:41:57] Comparison of ketogenic diet, low protein diet, and rapamycin for longevity.
  • [01:47:19] Inflammation’s role in adaptation and when to reduce it.
  • [01:51:17] Timing of ice baths relative to training for optimal recovery.
  • [01:52:33] Parting thoughts.

MORE DR. KEITH BAAR QUOTES FROM THE INTERVIEW

“The number one cost to the US medical system is actually musculoskeletal sprains, strains, and tears—the back and the neck as well as the rest of the body. It’s more than diabetes and heart disease combined.”
— Dr. Keith Baar

“If passive flexibility were really important for decreasing tendon injury, then the women’s gymnasts who have the most passive flexibility wouldn’t be the NCAA sport with the highest rate of Achilles tendon rupture.”
— Dr. Keith Baar

“Injury related to flexibility is a U-shaped curve. So our injuries are really high when we’re very inflexible. When we get into that sweet spot where we have good mobility, we can do the full range of motion, actually the injury rate is very low. If we become hyper-mobile, we actually have that injury rate go up as well.”
— Dr. Keith Baar

“We don’t use a ketogenic diet if we want to go fast, but if we’re training for life, we see that it increases longevity, that the ketones themselves are really good for brain function.”
— Dr. Keith Baar

“The first recorded immobilizer for an ankle or a leg is from Egyptian hieroglyphs, where they showed pictures 4,500 years ago. If I took you and you said you had cancer, you would not want a treatment that was developed 4,500 years ago. You would hope that something new had been developed in the last 4,500 years. That is where we are for our orthopedic situations.”
— Dr. Keith Baar

“The reality is that there are especially certain athletes like climbers where they’re doing all kinds of heavy lifts, they’re doing all kinds of heavy work, they’re doing all kinds of really dynamic moves. And what happens, what breaks down, is they break down in their finger tendons and they break down in the little pulleys within the tendons.”
— Dr. Keith Baar

PEOPLE MENTIONED

Vincent Van Gogh

Emil Abrahamsson

David Sabatini

Navdeep Chandel

Dwayne “The Rock” Johnson

Kozaburo Hayashi

Håkan Alfredson

Michael Kjær

Monika Lucia Bayer

Rod Whiteley

Natalie Gilmore

Timo Nyyssönen

Venus Williams

Luc van Loon

Stuart Phillips

Jon Ramsey

Valter Longo

Ron Maughan