If you are a black card member of Planet Fitness you may bring a guest to work out with you. You must be with your guest. Your guest is limited to basic membership use of the club.
I believe if you are a black card member ($21 a month) you can bring a guest with you every time you work out. They only have access to the exercise equipment and not the black card privileges though i.e. tanning, massage etc.
Thanks! Your answer is awaiting moderation.