I’m 58 years old in great health and would like to have my own class of women . Varity of ages. I love to make it fun , however ever second count. With results that will keep them coming back for more. I was a spinning instructor , and I had a guts & butts class ,years ago. Keep it simple with sensational results that come from persevering . Focusing on the goal , HEALTH .
you can find certification options on this website https://www.ideafit.com/certifications/group-fitness. Most people teach group fitness at a gym, and I am not sure how to interpret your comment about having your own class. Obviously, if you have the space and interested participants, you can teach a class independent of a club. But if you think of a specific club, I would check with them first to find out whether they have a preference for a certification.