Workout manager data as exercises, muscles or equipment.
Wger API is a free Sports & Fitness API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Wger API is listed in the Sports & Fitness category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Wger API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Wger API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Wger API is served over HTTPS, so it's safe to use in production.