I’ve recently discovered with the help of a friend, a group on facebook that meets every Saturday in a coffee shop and draws for hours quick posing. It is really nice because you meet new people and share different ideas about drawing and art. Sketches are from 30 seconds to 5 minutes. I try to capture the mechanics that will eventually help me in making animation. Another helpful thing is that it forces me to draw quickly, so an animation with a lot of frames could be done quicker.