Screen grab! Here are my Archs, I have picked points on every moving part of my spaceman's body, then at each frame I have tracked the same point. When they are all plotted I joined all the dots to see how smooth the curves are, if they are not making a smooth curve I know I have to change the position of his limbs to get the animation to flow, the animation will follow the curve smooth or not so its a habit I would like to discipline myself in.
I also used this for timing. Using blue arch in the middle I have made small notches that represent where I think new key frames should be. I have put them where I think I need a frame to soften an action or where I need to take one away. It has definitely taken time to plan this part out but I think it was worth it and will apply it to the rest of the scenes.