Easing in and easing out is an essential method for making your puppet's moves look real!
Easing in and out is the technique of moving your puppet less at the beginning and ending of a movement. If you analyze the way people move, you'll notice that they do the same thing. For instance unless your The Flash, you probably don't start running as fast as you possibly can right away. Instead, you start off slowly, then move into full speed. And unless you have gas brakes in your shoes, you won't be making any immediate stops either. The same thing applies when someone picks up an object: he won't jerk forward and grab the object, then jerk back. Instead, his hand will start off slower, go into full speed, then slow down when he reaches its goal.
Marc Spess made a great video showing how easing in and easing out works. Check it out below!