Blender – Bake NLA animation

Software:
Blender 2.79

When you wish to bake your NLA animation mix into one Action,
The Bake option in the Animation tab will not work.
The way to do this is to:

1. Select the object in Object Mode.
2. Press Space and type ‘bake‘
3. Choose Nla: Bake Action
4. In the Bake dialog, select Pose, deselect Only Selected, and press OK.
5. After the process, the Armature will have a new action that is the baked animation.