You can write data into Fulcra yourself — from a script, from a service, or from a file you already have. You are not limited to what Apple Health provides.
Apple Health is still the easiest route for health and fitness data, because anything that writes to Apple Health comes through to Fulcra.
How to write records and upload files is in the developer documentation: https://docs.fulcradynamics.com/cli/#writing-records
If you have suggestions for other data sources, please let us know by either joining our discord server, and posting to #product-feedback, or sending us an email at [email protected].