In order to start to animate with Blender in the best way, it is important to understand some basic principles defined in the 80's by Ollie Johnston and Frank Thomas. These principles are inherited from the 2D animation art called "traditional animation". Animation involves recreating the illusion of motion by a sequence of images. Most of these principles also work for 3D animation. Here, they have been developed for a cartoon style, quite far from realistic movements. So, we don't have to apply them to any situation, but they still contain the secrets of animation.
This is one of the common principles that applies to cartoon-style animation. The goal is to over-exaggerate the effect of inertia and elasticity on a particular object. From a 2D perspective, it's quite hard to manage because the object doesn't need to lose its volume, so we need to judge the shape by eye, but in 3D this is just a matter of a good rig.
