Which PT certification would you suggest? There are so many to choose from.
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As the excellent responses suggest there are a multitude of certifications that you can achieve. Your question is a bit confusing because you first refer to a PT (personal trainer?) certification. Then your text suggests group training. In either care, based on your education and experience, investigate those certifications for which you are qualified to test for so you can select the one(s) which will be help you achieve you goals.
Good luck.