I an­i­mated this a while back. I re­mem­ber it took me days. First I had to learn how to ac­tu­ally draw the hu­man skele­ton (The Atlas of Human Anatomy for the Artist by Stephen Peck is an amaz­ing re­source). Then I had to dis­till the ideas into the bare min­i­mum re­quired to get the pic­ture across. Finally I drew and an­i­mated the whole thing in piskel. The an­i­ma­tion process was quite te­dious, at least in part be­cause this was my first try.