As a coach or personal trainer, you are limited by your knowledge and skillset. Therefore, certifications are suitable; however, one could become too heavy-handed and lose sight of their focus.
The purpose of this article is to give insight into why I chose to go into physical therapy in contrast to obtaining more certifications.
Read From Coach to Student of Physical Therapy at its original source Breaking Muscle:
http://breakingmuscle.com/fitness/from-coach-to-student-of-physical-therapy