Is this a subscription or a one-time payment? John May 08, 2019 14:46 It’s a one-time payment. Once you buy HIIT., you won’t be charged again at any point and you’ll have it for good! Related articles What are the benefits of training with the HIIT Guide? How long will I have access to HIIT for? What makes Cut. different to other fat loss programmes? I’m a complete beginner to working out. Is Build. suitable for me? What equipment do I need access to?