That depends on the requirements of the certifying organization. ACE is 20 hours of continuing education contact time over two years, ACSM is 40 hours over three years, and so on. (I could be off on these so double check them.)
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Hi Janis. The CEC requirements vary from certifying organization to certifying organization. To get information on the specific requirements for a Personal Training certification renewal you would need to check with the specific organization that issued the certification.
I hope that this helps.