First launch.

The first time you open Tillen, an onboarding screen asks for your name and bodyweight.

Bodyweight is required because Tillen uses it to calculate estimated 1RMs for bodyweight and assisted exercises such as pull-ups, dips, and assisted machine work. Without a bodyweight value, those numbers cannot be computed.

Pick your unit (kg or lb). All weights display in your chosen unit across exercises, the plate calculator, and history. Internally, every weight is stored in kg.

You can change everything later. Update your name in Profile, your bodyweight via Profile → Measurements → Bodyweight, and your units in Settings → Units.