Lodovico Cortelazzo, Sport-Tech BlogField notes on training, technology, and sport-tech prototyping.https://lodocortelazzo.com/How I Would Have Won Physical: Italiahttps://lodocortelazzo.com/en/blog/physical-italia-how-i-would-have-won/https://lodocortelazzo.com/en/blog/physical-italia-how-i-would-have-won/A technical breakdown of every challenge from Netflix's Physical: Italia, a feasibility score for each one given my own physical profile, and whether I actually could have won.Thu, 08 Oct 2026 00:00:00 GMTYou're Not That Big. So How Are You Lifting That?https://lodocortelazzo.com/en/blog/how-muscles-produce-force/https://lodocortelazzo.com/en/blog/how-muscles-produce-force/The muscle is the last thing that matters.Wed, 07 Oct 2026 00:00:00 GMTBuild vs. Buy: Why I Open-Sourced Part of ODKI Instead of Protecting Ithttps://lodocortelazzo.com/en/blog/build-vs-buy-odki-open-source/https://lodocortelazzo.com/en/blog/build-vs-buy-odki-open-source/The ODKI sensor was never a secret worth protecting. The real decision was about what to open, what to keep closed, and why interoperability turned out to be the actual business strategy.Tue, 06 Oct 2026 00:00:00 GMTBuilding a Device Is the Easy Halfhttps://lodocortelazzo.com/en/blog/odki-open-vbt-sensor/https://lodocortelazzo.com/en/blog/odki-open-vbt-sensor/From IMU to product: the decisions behind ODKI, an open VBT sensor — what to build, what to give away, and what I'm still learning.Tue, 29 Sep 2026 00:00:00 GMTWhy Better Gym Machines Won't Make You Fitterhttps://lodocortelazzo.com/en/blog/gym-technology-sophistication-trap/https://lodocortelazzo.com/en/blog/gym-technology-sophistication-trap/The fitness industry keeps building better machines for the people least equipped to use them.Sat, 12 Sep 2026 00:00:00 GMTIMU Sensors in Sport: Why Understanding Quaternions Is Non-Negotiablehttps://lodocortelazzo.com/en/blog/quaternions-madgwick-vertical-velocity/https://lodocortelazzo.com/en/blog/quaternions-madgwick-vertical-velocity/When a barbell rotates, its IMU sensor stops measuring the right axis. Quaternions and the Madgwick filter fix this — here is how they work and why every sport sensor needs them.Thu, 03 Sep 2026 00:00:00 GMTYou're Not Overtrained. You're Lazy!https://lodocortelazzo.com/en/blog/overtraining-nearly-impossible/https://lodocortelazzo.com/en/blog/overtraining-nearly-impossible/Overtraining is real, but it's much harder to reach than most people think.Mon, 24 Aug 2026 00:00:00 GMTI Let an AI Tune My Firmware for 40 Iterations. It Made Things Worse.https://lodocortelazzo.com/en/blog/ai-firmware-autotuning/https://lodocortelazzo.com/en/blog/ai-firmware-autotuning/An honest account of trying to automate firmware parameter tuning with Claude Code, what the setup looked like, why it failed, and what it taught me about where AI actually breaks down.Tue, 04 Aug 2026 00:00:00 GMTThe Heavy Legacy of Vittori and Mennea: How a Method Built Around One Outlier Held Back Italian Sprintinghttps://lodocortelazzo.com/en/blog/vittori-mennea/https://lodocortelazzo.com/en/blog/vittori-mennea/A generation of sprinters ruined by a common misconceptionThu, 09 Jul 2026 00:00:00 GMTNRF24L01: the cheap 2.4 GHz radio that actually works in the field — if you know where it hideshttps://lodocortelazzo.com/en/blog/nrf24-wireless-sensor-networks/https://lodocortelazzo.com/en/blog/nrf24-wireless-sensor-networks/A practical guide to building wireless sensor networks with the NRF24L01 — what makes it the right choice for sport-tech field devices, and the one hardware mistake that cost me over a year of troubleshooting.Sun, 21 Jun 2026 00:00:00 GMTIMU sensors: why the accelerometer and gyroscope are useless alone — and powerful togetherhttps://lodocortelazzo.com/en/blog/imu-accelerometer-gyroscope-sensor-fusion/https://lodocortelazzo.com/en/blog/imu-accelerometer-gyroscope-sensor-fusion/A clear explanation of what accelerometers and gyroscopes actually measure, why each one fails on its own, and how combining them with a complementary filter solves both problems at once.Sat, 20 Jun 2026 00:00:00 GMTAccommodating resistance: how bands and chains fix the fundamental flaw in barbell traininghttps://lodocortelazzo.com/en/blog/accommodating-resistance-training/https://lodocortelazzo.com/en/blog/accommodating-resistance-training/Why a constant-weight barbell is never the optimal load throughout a lift — and how variable resistance fixes it, what the research says about how much to use, and which exercises actually benefit.Fri, 19 Jun 2026 00:00:00 GMTVelocity-Based Training: how bar speed tells you more than the weight on the barhttps://lodocortelazzo.com/en/blog/velocity-based-training/https://lodocortelazzo.com/en/blog/velocity-based-training/A practical guide to VBT — what it measures, why it beats percentage-based programming for finding your optimal training load, and which exercises actually benefit from it.Thu, 18 Jun 2026 00:00:00 GMTHow I Turned a Cheap Alarm Clock Into a Heads-Up Display for My Runs (Part 2)https://lodocortelazzo.com/en/blog/alarm-clock-training-device-part2/https://lodocortelazzo.com/en/blog/alarm-clock-training-device-part2/Wiring the ESP32, staring down a Chinese datasheet, and spending half a day brute-forcing a segment map — until the display finally showed the right number.Wed, 17 Jun 2026 00:00:00 GMTHow I Turned a Cheap Alarm Clock Into a Heads-Up Display for My Runs (Part 1)https://lodocortelazzo.com/en/blog/alarm-clock-training-device-part1/https://lodocortelazzo.com/en/blog/alarm-clock-training-device-part1/Reverse-engineering a projection alarm clock, an ESP32, and a heart-rate strap into a training device that throws my data on the wall in front of me.Tue, 16 Jun 2026 00:00:00 GMTWelcome — where sport meets the soldering ironhttps://lodocortelazzo.com/en/blog/welcome/https://lodocortelazzo.com/en/blog/welcome/Former national-team athlete, dual degrees in Sport Science and Engineering, fifteen-plus years of daily training. This is where I write about all of it.Mon, 15 Jun 2026 00:00:00 GMT