The more personal trainer certifications that you get, the better off you are when seeking employment in this field.  Although the demand for personal trainers has grown considerably in the past five years, more health clubs are looking for those who have a variety of different personal trainer certifications, including a CPR certification.  These certifications are relatively easy to obtain once you have taken a course in personal training.  Courses are available online as well as at your local community college.  A lot of people like working online as they can get personal trainer certifications and work at their own pace completing the online course, which is relatively easy once you have achieved some knowledge in the field of physical fitness.