How much is the Fitness First gym cashback? November 28, 2019 00:33 Updated The cashback is 20% of the RRP for the AIA Vitality membership type that you are on when your quarter ends. Related articles How do I qualify for the Fitness First gym cashback? What is the Fitness First benefit? How do I know if my gym cashback has been paid? When does the Fitness First gym cashback quarter start? What is the Active Benefits target period?