When I first saw Jason animating so fast in Flipbook, I decided to adopt the same workflow. But as I was not a 2D animator, I couldnt really understand the construction of this simple character. It was harder for me to pose it in Flipbook than in Maya. Same problem many of my friends faced. So this is a short tutorial dedicated to this easy guy who seems not so easy to some of us. This guy is adaptation to JRs 2D style so many thanks to him for this wonderful workflow.
Learn the construction. Its simply the combination of circles and lines