You would need to contact an organization that ‘certifies” instructors. There are several. I do teach aquatic fitness instructor courses, but they are for certified Personal Trainers and Group Fitness Instructors. These course are for continuing education and to provide instructors who are already certified with the knowledge, skills, and abilities to teach clients in an aquatic environment. I would suggest that on top of any certification, you have your aquatic instructors also obtain a lifeguard certification.