It's sort of frowned upon. Kids between 13 and 17 are permitted to work out with the direct accompaniment of their parent but it's really not a child friendly place.
Per P.F. website If you are less than 18 years old, you may not use this Site without the prior permission and supervision of your legal guardians. Planet Fitness does not accept members under the age of 13 and does not knowingly collect information from anyone under the age of 13.
No... I think is 15 and older
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