Squash and Stretch.

Squash and stretch is a method used in animation that pretty much writes itself.
It is considered the most important of the basic principles of animation.

The idea behind squash and stretch is that a subject, for example, a ball; will retain it's volume, but change shape in the process of movement to simulate the idea that it is interacting with it's surroundings.
These interactions could include falling, bouncing, moving at any kind of speed.
It is crucial when using "squash and stretch" to consider the spacing between frames, for the full desired effects to work, timing is absolutely vital.

Squash and Stretch is to create dynamic movements to achieve the whimsical flow that seems more realistic, despite a lot of the shapes formed being impossible in a real life situation.

These two GIFS are my own example of the difference adding squash and stretch makes when animating. The image to the left is certainly more pleasing to the eye and they are both the same object following the same trajectory.

Without Squash and Stretch

With Squash and Stretch

Many animations, films, and even illustrations have paid homage to squash and stretch over the years years and one particular artist that has stood out to me for using squash and stretch and 'anticipation' beautifully, is Ryan Woodward!

Some of his more known pieces is called "Thought of you", this animation is a hand drawn frame by frame of two character's dancing with one another.

Ryan Woodward has his own website that you can find HERE. 

 This animation is beautifully whimsical and a perfect example of Squash and stretch, though technically rotoscoped, he adds his own touch, including his unique colouring and style to the motion blurs and movement, with flawless flow. There's something rather intrinsic about this piece to me and is definitely one of my favourite pieces of work!