Notes from Plovdiv

The Journal.

Long reads on how I train, how I design Kinoku, and why your data stays on your phone. Plus what I learn building a fitness app on my own.

Why I built an offline-first fitness tracker

Most fitness apps treat your body as a data product. I wanted one that didn't. Here is the story of Kinoku.

HRV is one of the most useful recovery signals your body gives you. You do not need a paid band to read it. Here is a private setup on Android.

Macro, meso, micro: the three training cycles that make you stronger, explained with no spreadsheets.

Stop using your training calendar as a to-do list. Use it as a feedback loop between your plan and your reality.

Why most runners run their easy days too hard, and the simple 80/20 fix backed by research.