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, muscleups 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 custombuilt 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!