I've started exporting my sleep data from Garmin connect. And my expenditure, weight, nutrition, from macrofactor.

I add them to a spreadsheet along with other metrics I've been collecting manually for a long time, like tape, caliper measurements etc.

I do it weekly and then ask Claude to analyse the sheet.

It's super manual but just once a week and it can be really helpful / spots insights I often miss like how sleep affected something etc.