The most important characteristic that an employer looks for in a new group fitness instructor is the ability to plan and lead a class that is motivating and safe. Group fitness instructors often get started by participating in exercise classes and through taking training courses or attending fitness conventions. Most organizations encourage their group instructors to become certified, and many require it. This is to ensure that fitness instructors are teaching the correct fitness methods for each class.

Instructors must be able to plan classes according to the skills of the participants and monitor their well-being. Typically fitness instructors lead their classes through demonstration so it is necessary for them to exercise regularly to maintain their fitness level. Instructors must prepare routines for each of their classes and must also be excellent communicators in order to teach the material effectively.