If you want to make your own gymnast rings for training, then this video describes how I make mine. You can use gymnast rings for fitness training, CrossFit, callisthenics, muscle-ups and core strength exercises.
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The "over the door training platform" can be made to order, I will be selling these with adjustable rings and fitting kits for £220 each, these are custom-built products, very high quality.
This over door system will come with many optional extras and attachments, these are still being developed - updates and announcements coming soon!