Swimming lessons are available for most of the summer, given by certified instructors.

Every two years the card must be renewed, by completing an in-service with a certified instructor.

Our class of under 10 people began with a two-hour lesson by certified instructors.

She took a 200-hour course to become a certified instructor, and continues to make the videos, which have drawn over four million views.

It is the first academy a potential certified instructor must complete in order to attend any of the national academies.

And clubs tend to have several certified instructors as members.

Average class size is 12, led by certified instructors.

Each class is designed for a certain level of experience and taught by a certified instructor with a specialty area related to their particular class.

The program offers 9th-12th grade students hands-on experiences taught by highly certified instructors.

It wasn't possible simply to take the examinations; he had to be personally trained by the certified instructors.