Use root motion animations. Then (hopefully possible) use motion matching plugin to blend and animate. If it works you can trigger backflip just by moving character (capsule) right way.
Download “Game Animation Sample Project” and watch tutorials on GASP and Motion Matching System (both refer to same stuff, just some people do it wrong).
It is great plugin/system, it has multiple root motion animations, however it does NOT have backflips etc.
But there are packs on marketplace/fab that have it (lot of them at some point were free, and probably some are free now).
When you do above, search how to make realtime retargetting (to have your character use UEFN animation blueprints) and how to retarget animations to UEFN skeleton. Those are two different things.
- realtime retargetting allows you to use UE4, UE5, mixamo etc skeletons
- animation retargetting allows you to have single animation blueprint that can animate other skeletons. Like motion matching that uses UEFN skeleton, but you can import older animations and retarget them to uefn. So like opposite to realtime retargeting,
And best way to do some parkour etc now is that motion matching plugin.