Double backs and general tumbling

This is a short video of some moves I'm working on. I have had no gymnastic tutoring or coaching and have no access to it either.

Put simply from the poor camera angles provided I'm asking if anyone could give me any tips or some advice on improving my tumbling

Thank you in advance

Rick

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You need to reach up more before starting your turning for double back. You are travelling backwards instead of up, so by going up first then rotating it will be more correct than immediately going backwards while rotating. To do this swing your arms straight up when you leave the ground. Besides that, I'm jealous as hell