I use "constant" to make keyframe animations. But when I converted the animation curve to "bezier". The animation in the middle frame looks very strange. The rotation of the hand will be very exaggerated. This happened when I used Maya to make animations, but there is a command in Maya that can be used to optimize these animation curves. But I don't know if there is such optimization in Blender.
[![enter image description here](https://i.stack.imgur.com/rBFmN.png)](https://i.stack.imgur.com/rBFmN.png)
[![enter image description here](https://i.stack.imgur.com/yGpTY.png)](https://i.stack.imgur.com/yGpTY.png)

[![enter image description here](https://i.stack.imgur.com/r18t5.png)](https://i.stack.imgur.com/r18t5.png)