A short tutorial I made while studying at iAnimate to explain to the other students how rotation orders can affect your animation and how to change them on a shot that's already animated without breaking the animation.
NB! - Something I've learned since making this video is that the middle rotation is the one most likely to flip or cause gimbal issues. So if your character is doing most of the rotation in Y like my example, the rotation order I chose to change to (ZXY) will work fine and you could also use XZY. Just make sure Y is not in the middle (like the default XYZ) and it should work well.