From what age can you become a member of the pool? (can my child become a member) You must be at least 18 years of age to gain access to the SwimGym swimming pool. To become a SwimGym pool member you must have sufficient swimming experience (equivalent to Dutch swimming Diploma A) and have basic fitness. Related articles Is there a waiting list for the pool? What do I need to bring for a training session? Can I buy swimwear at the SwimGym pool? What is a single session personal training at the SwimGym pool? What is a Try-Out?