Field notes
Essays from Kin.
Notes on AI coaching, training around real life, and what it actually takes to log a workout. Quiet, honest, occasionally useful.
Why we built an AI fitness coach (and why "AI tracker" misses the point)
Tracking apps store the workout you already planned. A coach drafts the plan, holds the goal, and adjusts when the week changes. The category is shifting — here's the bet we're making on conversation.
Read essay →Voice workout logging: actually train, then talk
Tapping through five dropdowns between sets is a tax on the session itself. A look at why voice logging works, what it can't do yet, and how to make it disappear into the workout.
Read essay →How to track macros without the spreadsheet
Most people quit macro tracking inside a month — not because it doesn't work, but because the friction is its own second job. A practical guide to what "good enough" actually looks like.
Read essay →Returning to lifting after a long break: a 4-week ramp
The hardest day at the gym is the first one back. A four-week structure for rebuilding the habit before the load — what to do, what to skip, and how to know when you're going too fast.
Read essay →