You can now download all of your wellness data in a CSV and upload the same. Click “Options → Wellness” on the calendar page:
This is also supported by the API.
GET /v1/athlete/{id}/wellness.csv
Optional query params oldest (yyyy-mm-dd), newest (yyyy-mm-dd), cols (comma list of cols to download).
POST /v1/athlete/{id}/wellness
Accepts multipart/form-data with file param supplying CSV text.