5-Bullet Friday — HRV Adventures, A Film Confession and Obsession, Useful Book Highlights, Judo Jedi, and More

"De Graaf had put his finger on one of the sneakier problems with treating time solely as something to be used as well as possible, which is that we..  ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­

5-Bullet Friday   The latest from author and investor Tim Ferriss   Hi All!   Here is your weekly dose of 5-Bullet Friday, a list of what I'm pondering and exploring.   This edition is brought to you by ​Momentous​, my go-to source for creatine that I use mostly for cognitive support, especially when short on sleep. I took my daily 10 grams this morning, and I take 20⁠–25 grams on days when I need extra gears and will need to sprint. Be sure to see their offer in the P.S.   Device I'm using ​Optimal HRV Reader Version 2.0. I'm once again tracking my heart-rate variability (HRV), as I'm experimenting with vagus nerve stimulation to improve HRV and other metrics. But not all trackers are created equal. The latest Optimal HRV band enhances reading accuracy and significantly reduces artifacts, ensuring you get the most precise data possible. You can watch my video on HRV training here. The Morpheus device was also recommended to me by several high-level competitive athletes and is used by friends like Dr. Peter Attia and performance coach Andy Galpin. It seems clearly superior for tracking some types of exercise (e.g., Zone 2), but I found the Optimal HRV forearm band and app much faster and easier for simple morning HRV checks. I have both and plan on using both for different applications.   Short highlight video I'm watching ​The Little Giant - Ryuju Nagayama (2025 World Champion). I thought I'd seen all the most explosive judo fighters, and I was wrong. Nagayama's throws show power and dizzying versatility at the highest level. And, most impressive, his movement is crisp and clean, like a perfect bedsheet at the Four Seasons. From the description: "Nagayama is the 2025 world champion and two-time bronze medalist. He is also an Olympic bronze medalist and 2022 Asian champion. For a long time, Nagayama was one of the most exciting judokas in the world. Despite his small height, he is one of the most powerful athletes in lower weight classes."   Article I'm reading "Psychedelic Therapy Crashed and Burned. MAHA Might Bring It Back" by John Semley (WIRED). As the young whippersnappers might say, there's a lot of tea in this one.   Movie I'm absolutely loving ​KPop Demon Hunters. I'm late to the party, but better late than never. Now, I'm gonzo. I've been force-feeding myself all of the related YouTube videos I can find. This animated action-musical is everywhere and has become Netflix's most popular film of all time. But I didn't know any of this until last night. I showed up for my annual full-body MRI (e.g., Biograph or Prenuvo) yesterday, and the technician said, "For your viewing, I see you requested KPop Demon Hunters," to which I replied, "What the hell is that?" Then I realized that I'd been punked by my assistant. Nice one. I decided to roll with it, and I'm so glad that I did. It has a 99% audience score on Rotten Tomatoes. As soon as I finished it, I thought, "Oh, I could easily watch this again tomorrow." The animation is truly spectacular, and the music is the most earworm-rich that I've heard in years. ​ But the real magic is story, story, and story. This one is elegantly architected and beautifully polished. If you want to dig under the hood, consider starting with The Writer's Journey or Save the Cat! Goes to the Movies. ​ Short description: "K-pop superstars Rumi (Arden Cho), Mira (May Hong), and Zoey (Ji-young Yoo) use their secret identities as demon hunters to protect their fans from growing, supernatural danger. Together they face their biggest threat: an irresistible rival boy band of demons in disguise." Yes, it sounds like the last thing I'd ever want to watch, and yet… I'm a true believer. ​ It's co-directed and co-written by Maggie Kang and Chris Appelhans. For the screenplay, Maggie and Chris were joined by the writing duo Danya Jimenez and Hannah McMechan, with the original story coming from Maggie. Watch the trailer here. ​ This film was seven or so years in the making, and it paid off. Here are just a few impressive stats: ​ • It has become Netflix's most popular film ever with 266M+ views. • Four songs from the soundtrack simultaneously hit the Billboard Hot 100 Top 10—a record. • The song "Your Idol" by the fictional (read that again) Saja Boys reached #1 on Spotify's US chart, the highest placement ever for a K-pop boy band, surpassing (real) #1 K-pop boy band BTS. • The KPop Demon Hunters cast, collectively, amassed more than 2.09 billion streams worldwide on Spotify, averaging ~30 million daily streams on 13 tracks. ​ I had so many questions after watching this. Who made this?!? Why wasn't it in theaters? How and why and when and who?!? ​ So, if you're curious about that side of things, here's one piece about the whole enchilada: "The Tragedy of 'KPop Demon Hunters.'" ​ To be clear, I don't think it's a tragedy. Sony made a justifiable decision based on the circumstances and information they had at the time. So criticizing their decision is somewhat like critiquing a top poker player for folding when they ran all the math and probabilities correctly but ended up with a one-in-a-million flip thereafter that would've been a windfall. Judge people by processes and not outcomes. Still… damn, Netflix. Lady Luck has smiled upon you, and nicely done.   Book highlights I'm pondering All the highlights below are from Four Thousand Weeks: Time Management for Mortals by Oliver Burkeman: ​ ​"After years of trying and failing to make time for her illustration work, by taming her to-do list and shuffling her schedule, Abel saw that her only viable option was to claim time instead—to just start drawing, for an hour or two, every day, and to accept the consequences, even if those included neglecting other activities she sincerely valued." ​ …​ ​ ​"The derision we heap upon the avid stamp collector or train spotter might really be a kind of defense mechanism, to spare us from confronting the possibility that they're truly happy in a way that the rest of us—pursuing our telic lives, ceaselessly in search of future fulfillment—are not." ​ …​ ​ ​"The only faculty you can use to see what's happening to your attention is your attention, the very thing that's already been commandeered. This means that once the attention economy has rendered you sufficiently distracted, or annoyed, or on edge, it becomes easy to assume that this is just what life these days inevitably feels like. In T. S. Eliot's words, we are 'distracted from distraction by distraction.' The unsettling possibility is that if you're convinced that none of this is a problem for you—that social media hasn't turned you into an angrier, less empathetic, more anxious, or more numbed-out version of yourself—that might be because it has. Your finite time has been appropriated, without your realizing anything's amiss." ​ … ​ "De Graaf had put his finger on one of the sneakier problems with treating time solely as something to be used as well as possible, which is that we start to experience pressure to use our leisure time productively, too." ​ … ​ "The most fundamental thing we fail to appreciate about the world, Heidegger asserts in his magnum opus, Being and Time, is how bafflingly astonishing it is that it's there at all—the fact that there is anything rather than nothing. Most philosophers and scientists spend their careers pondering the way things are: what sorts of things exist, where they come from, how they relate to each other, and so on. But we've forgotten to be amazed that things are in the first place—that 'a world is worlding all around us,' as Heidegger puts it. This fact—the fact that there is being, to begin with—is 'the brute reality on which all of us ought to be constantly stubbing our toes,' in the splendid phrase of the writer Sarah Bakewell. But instead, it almost always passes us by." ​ ​One of my favorite chapters from the book is titled "Cosmic Insignificance Therapy," and you can find it for free here. It left me with a profound sense of calm that lasted several days. It sticks with you. You can complement this edition of 5-Bullet Friday with my brand-new conversation with Dr. Dominic D'Agostino on all things ketones, sardine fasting, and much, much more. ​ And, as always, please give me feedback on X. Which bullet above is your favorite? What do you want more or less of? Other suggestions? Please let me know. Just send a tweet to @tferriss and put #5BulletFriday at the end so I can find it. ​ Have a wonderful weekend, all. ​ Much love to you and yours, ​ Tim ​ P.S. Deal of the Week — Momentous​ high-quality creatine for cognitive and muscular support We are all quickly learning that creatine is no longer just about muscle and strength; it has a wide range of other benefits for cognitive performance. A recent double-blind, placebo-controlled study found that creatine can restore aspects of memory and attention within hours in adults who are sleep deprived. This is remarkable, considering most cognitive supplements can take weeks or months to exert a noticeable effect. ​ Creatine has become a staple in my daily nutrition protocol, but not all creatine is created equal. I use Momentous Creatine, as it's made with Creapure®, the German-sourced gold standard that is 99.9% pure and rigorously third-party tested to ensure label-claim accuracy and quality. Whether it's in the gym, recording a podcast, or recovering from an early or red-eye flight, creatine helps me operate at a higher, consistent level. Momentous products are certified by NSF to ensure what's on the label is what's in the bottle and nothing else, and they are trusted by 200+ pro and collegiate teams. Try Momentous for yourself and get 35% off your first subscription order with code TIM at LiveMomentous.com/Tim. International shipping is available. Forwarded this message? Sign up here. Join millions of monthly readers. Get exclusive content, private Q&As, giveaways, and more. No spam, ever. Just great stuff.   Sign Up   Listen to The Tim Ferriss Show Podcast The Tim Ferriss Show is one of the most popular podcasts in the world with more than one billion downloads. 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