In studying animation I've been jumping back and forth from one thing to another leaving blanks in between. And like in actual animation, this led to jittery blocky works and confusion with the simplest aspects of animation for me. So I decided to in-between those spaces, fill in the essential things that will help me move forward without having a thought in the back of my mind that I've forgotten or misused something.
I chose an animation course with Aaron Blaise and started with that "falling ball". I've never actually had this exercise in school so it didn't feel like repeating the alphabet, rather like wearing glasses for the first time - a bunch of things (i.e. mistakes) became clear!
Also I didn't want to turn the process into a dull routine (especially, if there's just a ball falling on the screen), so I varied the results a little bit. Below are couple of examples of that exercise:
Just a side note: it was interesting to see how "independent" the ball gets if you give it an extra frame when it lifts off of the ground, almost in a "froggy" way... therefore it's green, probably:)