So we are working with multiple compaines on more integrations. So we are starting to work on our APIs. We added Oauth support for reading your personal calendar.
This is a technical swagger documentation (we are improving it today a little)
https://api.trainerday.com/api-explorer/#/calendar/get_calendar
If you want to use either our old “get workouts” which is basically like a simple search, or get calendar, which returns calendar data. Let me know. Please explain why you want to use it a little and as well which methods you need access to. The calenar is easier for me to give access to 
Request here