Outside columnist, author of THE EXPLORER'S GENE and ENDURE, Globe & Mail, ex-physicist, not-quite-sub-4 miler.

Toronto, Canada
The Explorer's Gene is out TODAY! Try before you buy: -excerpt in @TheAtlantic: theatlantic.com/science/arch… -excerpt in @outsidemagazine: outsideonline.com/culture/bo… -newsletter interview with @DavidEpstein: davidepstein.substack.com/p/… -podcast with @richroll: richroll.com/podcast/alex-hu…
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Baking soda to counter the effects of altitude? A new study finds a 1.2% gain for 40K cycling at 1,800m. But that's actually no better than the same group found at sea level - so more evidence that it works, but nothing special about altitude. outsideonline.com/health/tra…
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Awesome - so glad to hear that you enjoyed it, Marc!
I have just finished "The explorer's gene" by @sweatscience and I loved it. I see some answers to my questions and I love the 5 rules that close the book: 1. Explore then exploit 2. Seek the uncertainty sweet spot 3. Play more 4. Minimize regret 5. Embrace the struggle
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Alex Hutchinson retweeted
Our 2nd monthly issue, "Biology's New Era," is live now on bigthink.com. In this issue, we explore the bleeding edge of biotech, as well as the scientists, writers, and philosophers whose efforts helped get us here. Some of what's inside: ⬤ Scientist-turned-writer Alex Hutchinson @sweatscience uses the legend of Secretariat to probe the limits of human athletic performance. ⬤ Futurist Peter Leyden examines how synthetic biology could help save Earth. ⬤ Astrophysicist Ethan Siegel @startswithabang challenges the leading theory of how life began. All that and much, much more. We hope you enjoy.
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A new study on an old question: does exercise actually burn (net) calories? Or do our bodies respond to exercise by cutting back on, e.g., immune function and cell repair, with potentially negative consequences at high levels? The evidence is... mixed. outsideonline.com/health/tra…
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Thanks, Michael -- super to hear that you enjoyed it!
“But it’s enough, for now, to know that when the moment of truth comes, science has confirmed what athletes have always intuited. There’s more in there, if you’re willing to believe it.” First book of the year down. Highly recommend the work from @sweatscience!
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Alex Hutchinson retweeted
“But it’s enough, for now, to know that when the moment of truth comes, science has confirmed what athletes have always intuited. There’s more in there, if you’re willing to believe it.” First book of the year down. Highly recommend the work from @sweatscience!
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Kristian Blummenfelt's apparent VO2max record of 101 (and why scientists are skeptical of his respiratory exchange ratio), bone health for cyclists, freediving physiology, and the trouble with a recent exercise/longevity study. My latest Substack: sweatscience.substack.com/p/…
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There's been a ton of discussion about the recent @BMJMedicine paper on exercise variety and longevity. I have some thoughts, including on why statistically adjusting for BMI, blood pressure, cholesterol, etc. creates the illusion of a plateau: outsideonline.com/health/tra…
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My favorite detail from this one, from a detailed Finnish study of infection rates in their 2018 Olympic team: to avoid acquiring or passing on infections while traveling, fly business class. Still trying to convince my editors. outsideonline.com/health/wel…
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The update we've all been waiting for, from @seaningle. Sounds like mostly good news for Ingebrigtsen fans, though we'll have to wait until summer to find out.
Travelled to Norway to speak to Jakob Ingebrigtsen. He was fascinating on so many things, including his obsession with winning, autism, his love of cars and so much more theguardian.com/sport/2026/j…
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Alex Hutchinson retweeted
An Underappreciated Variable in Sports Success: Sometimes athletes just get lucky. theatlantic.com/health/2026/… via @sweatscience
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Trying something new for this edition of my email newsletter: "outtakes," short takes on studies I pitched for Sweat Science columns but that didn't make the cut. Check it out here: sweatscience.substack.com/p/…
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This is the ultimate parable about modern fitness. Nice work, @Jon_Finkel! Hope you had a nice walk this morning.
The quiet revolt against tracking every damn thing in fitness is upon us and getting louder. This Manologue column is exploding. Read it and let me know. Are you unplugging too? Let me tell you a story: For over fifteen years, I’ve started every single day the exact same way: walking my dog. It began in 2009 with our first Labrador, Mr. P, and it continues today with our current lab, Lyla. Different dogs, same routine. I wake up, get the kids ready for school, see them off, then grab a leash, grab the dog, and head out for a 20 to 30 minute walk around the neighborhood, usually about a mile and a half. I’ve done this walk in five different cities across two states, from the Intracoastal in Delray Beach to downtown Dallas fitness trails to quiet suburban ponds, and now back in Florida along various lake trails near my house. I loved these walks because they’re simple and relaxing. I was outside, getting fresh air and sunshine, feeling my blood start moving and spending quiet time with my dog. There was no “goal”. No plan. My mind wandered wherever it wanted, and more often than not, that wandering produced story ideas, book concepts, chapter transitions, Manologue columns and creative solutions I didn’t even know I was looking for. Then I screwed it all up. It started with podcasts. Like many of you, I discovered there were more podcasts I wanted to listen to than hours in the day, and since I worked from home with no commute, I decided my morning walk would be the perfect time to catch up. At first, it seemed harmless enough. I put in my headphones, hit play, and walked as usual. But something quietly disappeared. The good ideas that used to show up on those walks slowly vanished. My mind stopped drifting and started consuming. Instead of letting thoughts wander, I was processing information, absorbing advice, and filling every quiet moment with someone else’s voice. From there, things escalated the way they always do when optimization enters the chat as my kids say. After listening to one pod I decided to start tracking my walks, so I got a WHOOP to monitor my heart rate and make sure I was hitting that super coveted Zone 2 cardio. But, WHOOP didn’t track my route, which meant I had to add the Nike app to log mileage, pace and time. I then listened to a guy share how a breathwork app was the perfect way to start his walk, so I figured I’d try that. Before long, I was monitoring my walk across my phone, a tech wearable, three apps and, yeah, still listening to a podcast. Then the optimization fitness bros explained that walking was fine, but if I really wanted to level up, I should be rucking. So then I added a 20-pound vest, and my peaceful morning walk officially became an exercise in obsessive compulsive protocol. What used to involve grabbing a leash and heading out the door turned into a full preflight checklist. Vest on. WHOOP charged. Nike app activated at the exact moment I stepped outside. Podcast queued. Phone synced. Headphones in. I had tech on my wrist, in my ears, and in my pocket, all in service of optimizing something that had never needed optimizing in the first place. Soon, I stopped looking forward to my walks altogether. I wasn’t noticing the birds, the trees, or the water. I wasn’t talking to neighbors anymore. I wasn’t letting my mind wander. I was just another jagoff marching around the neighborhood, locked into Zone 2, tracking distance in an app, listening to someone explain how to better optimize a cup of coffee with some BS new algae powder, all while wearing a weighted vest and looking like I was about to deploy overseas.... Read the full Manologue and how I snapped out of this nonsense (and how you can and should, too) for FREE HERE: midlifemale.com/how-i-stoppe…
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Alex Hutchinson retweeted
The debate over what makes an athlete successful commonly centers around talent versus hard work. But two researchers have started to consider a potentially even-greater variable, writes @sweatscience: sheer luck. theatlantic.com/health/2026/…
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If a contest depends 49% on talent, 49% on training, and 2% on luck, it generally takes excellent luck in addition to good talent/training in order to win. My latest in @TheAtlantic, on the role of luck in athletic development (gift link): theatlantic.com/health/2026/…
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Shoe tech, carbs, supplements, physiological resilience, the optimal uphill slope... these were the ten most popular Sweat Science columns of 2025: open.substack.com/pub/sweats…
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I love the idea of "book-loading" before (very) long runs! Thanks for including my book, Sabrina. (And yes, my new anti-GPS stance has led me to some embarrassing "unplanned explorations" too.)
I wrote about why runners should read before races, and I included a list of some of my favorite books from the past year. New column: irunfar.com/a-carb-load-but-…
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Alex Hutchinson retweeted
How much energy can the world’s best endurance athletes sustain over long periods? Find our in our new paper: Longitudinal Assessment of Total Daily Energy Expenditure in Professional Cyclists Supports a Maximal Sustainable Metabolic Ceiling More details and link in comment
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I thought feeling dizzy when you stand up too quickly was something to do with high cardiac fitness. But a cool new study suggests that the repeated up-and-down motion of running (but not, say, cycling) desensitizes the motion sensors in your inner ear. outsideonline.com/health/tra…
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