HeyJaredMarco Altini’s Substack
Heart rate variability (HRV), Endurance Coaching, Technology, Life, and other ramblings
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- Sep 28, 2026
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Recent articles and updates [July-September 2026] (opens the original)
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Hi there 👋I hope all is well.Below is a new recap of articles, research, and updates from the past few months. It’s been a few good months, helping the team at augo build the future of endurance coaching, developing protocols for race nutrition based on individual characteristics of the athletes I work with, and also building up my own training to consistent ~100-mile weeks. We’ll
[Podcast] VO₂max, HRV, Lab Testing: What Actually Changes Your Training with Marco Altini (opens the original)
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From the show notes:A high VO₂max can be a sign that you are inefficient, not that you are fit.That is one of several ideas Marco Altini takes apart in this episode.Marco is co-founder of HRV4Training, an endurance coach, an advisor at Oura, and a guest lecturer at VU Amsterdam.He holds a PhD in data science and master’s degrees in computer science engineering and human movement sciences. He is also Bruna’s coach and an advisor to augo.We start with why he prescribes almost everything by perceiv
[Podcast] The Freedive Cafe: HRV4Training (opens the original)
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From the show notes:Marco Altini is a scientist, developer and athletic coach who’s work centres on the intersection of health, technology, and human performance.In 2012 he founded HRV4 Training, a mobile platform that revolutionised physiological tracking by becoming the first app capable of reliably measuring heart rate variability (HRV) using a smartphone camera.In this episode we discuss:Donny has been using Marco’s HRV4 Training APP for ten years now.First we fill Marco in on what free
[CoachCorner] The augo [Claude/ChatGPT] Connector is the Best Thing that Ever Happened to Coaching (opens the original)
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As you might know, I’ve been advising augo for the past few months, and the team has just released a connector (also called MCP from now on) to link up everything that is in augo (athletes’ workouts, notes, subjective feedback, etc.) with, e.g., Claude (currently my AI tool of choice). This connection enables me to do literally everything I always wanted to do with athletes’ data but either could not do or would take me forever to do because we are stuck using coaching platforms designed decades
[CoachCorner] Race Fueling for Endurance Athletes: Considerations and Tools for Individualization (opens the original)
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In this blog, I’d like to cover my process and considerations when working with athletes in the context of their race nutrition strategy for endurance events (e.g., from the marathon onwards, as many of these considerations don’t really apply in the same way to shorter distances given we don’t face the same physiological limitations). Needless to say, athletes are extremely different in terms of their 1) power output (simply put, how fast they are running in absolute terms), 2) metabolic fle
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