How do I change units, plates and heart-rate zones?

Set kilograms or pounds, tell the app which plates you actually own, and set your zones.

Go to Profile and open the settings you need
Units, plates and heart-rate zones each have their own screen.
Set your units
Kilograms or pounds, centimetres or inches. This changes what you type and what you read, everywhere.
Tell it which plates you have
The plate calculator works out what to load per side. It is only right if it knows what is actually in your gym.
Set your heart-rate zones
Zones drive how cardio sessions are scored. Setting them from your own numbers rather than a default makes the scoring mean something.