Hello Candidate,

The letter could be of the following format-

Salutation,

I came to know about the vacancy of a Yoga Instructor through recently Newspaper Advertisements/ (any other source through which you came to know about it).

I have the experience as a Yoga Teacher for the last (your experience) at XYZ Yoga classes, and have the knowledge of Yoga forms such as Power Yoga, Aerial Yoga, and Aerobics too.

If you need, I can also have a Demo Class at your Yoga Center for trial purposes. Hoping for a speedy reply from your side.

Thank You.

(Your Name)

(Contact Number).