4 Minute Fridays: The Exercise That Saved My Lower Back, The EXACT Amount Of Sleep Needed To Slow Aging, & A Thread Every Person Over 30 Needs To Read
Jun 26, 2026
Welcome to 4 Minute Fridays, my weekly newsletter, where I reveal cutting-edge tips to help you get lean, boost energy, and live longer.
What's In Store For Today:
- The exercise that saved my lower back
- The EXACT amount of sleep needed to slow aging
- A thread every person over 30 needs to read
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Hey friend,
The other day, I saw someone online questioning why they should work out on vacation.
I had to chime in. I asked them one simple question: "Do you stop brushing your teeth when you go on vacation?"
Obviously, no (I hope).
We need to stop thinking about exercise as a tool to achieve an outcome (ie, lose fat, build muscle, look good, etc.) Start thinking about it as basic human hygiene.
In today's world, it's as essential as brushing your teeth. Treat it as a foundation of being a high-performing human being.
Should you work out on vacation? I'm not here to tell you what to do. But for me? Absolutely.
Not to lose fat. Not to build muscle. Just to maintain the baseline that makes me feel like myself.
Here's what caught my attention this week.
Here Is Your 4 Minute Friday:
1. The Exercise That Saved My Lower Back
Gif courtesy of strength log
In my 20s and 30s, I dealt with severe chronic low back pain. Whenever I stood up from a chair, I looked like an eighty-year-old man who had just had hip surgery.
I remember going to a chiropractor, and his prescription was that I needed to get my back adjusted every week for $75 a pop.
As a struggling personal trainer at the time, I said, “Screw that, I’m going to find my solution.”
Then I found Dr. Stuart McGill's Big 3: the curl-up, bird dog, and side plank. These exercises were designed to stabilize the muscles around your spine, and they worked.
But stabilizing a weak structure only gets you so far. You eventually need to strengthen it, and that's where the back extension comes in.
One important nuance: this isn't about bending your spine back as far as it'll go. You want to hinge at your hips and squeeze your glutes to raise your body. Stop when you're parallel to the floor. Overextending the lumbar spine is exactly what causes the problems you're trying to fix.
Done right, the back extension builds the posterior chain, protects the spine, and trains the muscles that hold you upright all day.
Stabilize first. Strengthen the second. That's how I saved my lower back.
2. The EXACT Amount Of Sleep Needed To Slow Aging
Photo courtesy of Nature
How much sleep do we need to be healthy and slow aging? A new study published in Nature put a number on it.
Researchers analyzed data from 500,000 people and built biological aging clocks for 17 different organs.
The results showed a clean U-shape: sleeping too little or too much makes your organs age faster, with the sweet spot between 6.4 and 7.8 hours per night.
Sleeping under 6 hours was linked to a 50% higher risk of early death. Sleeping more than 8 hours was not much better.
Keep in mind that range refers to actual sleep, not time in bed.
If it takes you 30 minutes to fall asleep, you are not getting 8 hours. You are getting 7.5 hours, maybe even less. If you wake up at 2:00 a.m. and lie there for 20 minutes, that counts too.
Most people overestimate how much they sleep by 30 to 60 minutes. You do not need to obsess about the exact number. If you are in bed for 8 hours and still waking up groggy, the issue is probably not how long you slept. It is how well you slept
❤️ My Favourite Thing This Week
— Howard Luks MD (@hjluks) June 22, 2026
Don’t let your life 'narrow'.
I’ve been an orthopedic surgeon for 30 years. The thing I watch happen to people — more than any injury or surgery — is what I call the narrowing.
Most of my patients have no idea it’s happening. They think it’s just aging. It’s not...
Dr. Howard Luks has been an orthopedic surgeon for 30 years, and I’m also lucky to call him my internet friend. He recently shared a thread about the thing that happens to people more than any injury or surgery: what he calls “the narrowing.”
The "narrowing" is a slow, gradual shrinking of what your body allows you to do, or what you assume you should be able to do at your age. You used to carry four grocery bags, now you carry two. You used to be able to sit on the floor, but now you take a chair.
Nobody decides to narrow their life. The body quietly loses capacity when you challenge it less, and your choices adjust accordingly. Over a few years, the smaller version becomes your new normal.
Yes, there is some real, unavoidable decline. Your VO2 max, strength, and power can drop faster after 50, but these can also be maintained. The unavoidable part is only a small fraction of what most people are actually losing. The rest is disuse.
Trained adults in their 70s often outperform untrained adults in their 50s. The narrowing is not a schedule, it’s a choice, even when it doesn’t feel like one.
Your job, if you choose to accept it, is to fight the narrowing of your life by maintaining the foundations of physical and mental health, and by not falling for the lie that aging leads to a lower quality of life
Client Of The Week - Ethan, Entrepreneur
Ethan is an entrepreneur who came in struggling to stay consistent with both workouts and nutrition.
He wanted to lose weight, boost his energy, and finally lock in a routine that stuck.
In just a few months, he’s lost 28.4 lbs, dropped 5.5 inches off his waist, and now consistently hits his workouts and macros every week. The result? He’s feeling stronger, leaner, and more energized across the board.
Here's how we did it:
- Focused on simple, effective strength training
- Dialed in a macro-based nutrition plan that fits his lifestyle
- Built accountability into his weekly routine for lasting momentum
Ethan didn’t just make a change, he made it stick. Outstanding work, Ethan!
One Quote To Finish Your Week Strong
“For the unlearned, old age is winter; for the learned, it is the season of the harvest.”
― Hasidic saying
The Greeks have a term for when a person crosses into mid-age: Metanoia
It means a profound, transformative change in one's heart, mind, or way of life.
Reaching this point is not a death sentence but an opportunity to take what you've learned to create new beginnings.
As promised, get healthier in under 4 minutes.
- Dan
When you're ready, here are 2 ways I can help:
1. The Lean Body 90 System: When you’re ready to get in great shape, Lean Body 90 is the obvious choice. You can get in great shape and reach your fitness goals in just 90 minutes a week. Lose weight and build muscle even without hours in the gym or highly restrictive diets. Join 1000+ students here.
2. Are you an entrepreneur who wants to get lean, boost energy, and get in your best shape? Apply for private one-on-one coaching here.
References
- The MULTI Consortium, O’Toole, C.K., Song, Z. et al. Sleep chart of biological ageing clocks in middle and late life. Nature (2026). https://doi.org/10.1038/s41586-026-10524-5
Disclaimer: This email is provided for educational and informational purposes only and does not constitute providing medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice should consult with a licensed physician.