Front Flip Animation Bones Rotate After A Certain Degree I have this front flip animation that when I rotate it about the X axis as shown in the video linked below, the root and target bones flip all the way back around and then get to the finish pose.

This animation was originally a quaternion animation but has been since converted to XYZ euler

Video: https://streamable.com/w2wg3a
For the moment from frame 56 to 64, the root bone goes from 146° to 70°, so your character is flipping back. You need to make the bone rotate from 146 to 250 then 360° for example.
Also, it's better to create a root bone that is completely independent, at the bottom of the character, and not use the spine as the root. Instead parent the spine to the root you've created.