It all depends on what you would like to do in the fitness world
As a physiotherapist you are already educated.
I personally would go for the Gold Standard certifications
ACSM, NASM and ACE
Narrow down your niche, for instance, do you want to do group training or personal training or work with a specific group?
ok i want to be both group and personal also. ace is the basic of fitness. and i m already helding a deegry than why should i go for certification. if i have to than why ace there is nothing advance. like doing master in physio after graduation. there is nothing like master course.and whats the difference bw ace and ah$fs. or else both r same
I would definitely get certified. If you wish to get into this type of training, a certification other than your Physical Therapist will be required.
Is there any specific type of clients or population which you are looking to work with (athletes, kids, seniors, groups, 1-on-1, etc.)? This will help you narrow down the type of certifications you need to be focusing at. There are many great certifications which offer continuing education and other perks that will help you improve your knowledge as a fitness trainer. ACE, NSCA, ACSM offer some high level certifications.
Also keep in mind that you will need liability insurance as well. You can find one here in IDEA at https://www.ideafit.com/fitness-insurance .
I hope this helps.
I can understand your perspective that you are looking for an advanced personal trainer certification because you already are a physical therapist.
However, the requirements on a personal trainer are usually very different from those for a physical therapist. Unless you have an interest to work with people after they just left physical therapy, you will be required to develop exercise programs for healthy people who want to be challenged in a variety of ways, both for weight training and cardiovascular exercises but also flexibility and balance. You will need to know how to progress them, and I doubt that this is the object in physical therapy.
Since you are in India, I would suggest that you take a look at the NASM international personal trainer certification. Here is a link: http://www.nasm.org/personal-trainer/international-cpt