Beina — Field notes

The Blog

Training science, race prep and event guides for endurance athletes — from the team building your coach.

FeaturedTraining science29 Jul 2026

Fuel for the Work

A deep-dive report into the world of nutrition for endurance sports, in an attempt to translate some of the most recent research into actionable advice for athletes.

Read the story

All posts

09 entries

30 Jul 2026July Updates: Going public, scheduling cake consumption, and flexing on the socialsBeina is now open to the public. We came out of the shadows! Also this month: 275+ events, the /fuel command, shareable session cards, and a beefed-up status page.Product 30 Jun 2026June Updates: Pufferized is now Beina!The month we changed the name and moved everyone across. What Beina means, and what happened to your account.Product 28 May 2026May Updates: Loads of new features, with a catchA teaser of things to come — the month we built the relaunch that became Beina.Product 24 Apr 2026April Updates: A Proper Fitness Model, a New Status Page, and In-Chat ReportsA proper two-dimensional fitness model, a redesigned status page, RPE feedback, and in-chat reports.Product 24 Apr 2026Fit, but for what?One month down a sports-science rabbit hole — and how it changed the way we track fitness, fatigue and form.Sports Science 30 Mar 2026March Updates: Coach V5, Garmin Integration, Predictions for EverythingThe Coach rebuilt from the ground up, Garmin officially in the building, and AI predictions for 13 events.Product 18 Feb 2026February Updates: Race Planning improvements, Journalling, Secondary events, and a step towards intervalsAn improved race-planning interface, a journalling system that makes the Coach smarter over time, support for events beyond the Puffer, and a few other tweaks.Product 17 Feb 2026The Slush Puffer, and Other Stories from the ForestWas 2026 really the slowest Puffer to date? Looking over 16 years of race data, we think it probably was.Race data 26 Jan 2026January Updates: Post-Puffer analysis tools, 15 years of historic data, and a few more improvementsA summary of some updates made in the last few weeks — 15 years of race data, a coach that remembers, deep race analysis, and more.Product

New posts, straight to your inbox

Training insights and product updates. Roughly one email a month.