there are many certifications to choose from, but i researched a lot before i chose my mine, and i went with NPTI, it is not well known “yet” but what i like about it was that there is a lot of hands on experience. you have your theory part, your nutrition and your gym sessions where you will be training other participants in the course as future clients. the gym membership will be included in your tuition, and you will be joining a local gym. well that was here in NC but some NPTI schools have their own facility. you will learn how to apply what you learn in the class. every session will be different than the next. the instructor will train you how to deal with different cases in cleints, so you wount feel any restrictions when training them.
hope this helps
best of luck