Animation is based on 12 principles created by the "Old Men" at Disney. These animators where the creators of some of Disney's original films like Snow White, Sleeping Beauty, The Lion King, and Pinochio. Every principle plays an important role in the animation process. Using each one helps create a more fluid and clean animation.
The bouncing ball is the original "first animation" It teaches squash and stretch, pose to pose, anticipation, follow through, arcs, timing, and slow in slow out.