I did my comprehensive certification through ITT located at A Body of Work in the Presidio in San Francisco. They have the option of just getting a mat certification if you do not want to do the equipment. The program there is quite thorough and will definitely help you challenge your clients while keeping them safe!
Balanced Body education is offered at EHS in SF. Here’s a link to the education finder – just select EHS as the educator: https://www.pilates.com/BBAPP/V/education/education-finder.html We also offer lots of Mat and Toys workshops.