Personal Trainer Cert

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I know there are a ton of posts out there on this (which I have been reading) but any suggestions on what Cert to start out with. To start, I am interested in just learning more and getting myself into better shape, but am also considering in the future doing it as my job.

So any suggestions on what to get certified in and why? Or any experience anyone out there has would be great?! I have already emailed the Manager at my gym to get her opinion also, but was looking for other suggestions.

Thanks!! :)