For the 30 sec poses, I think you gotta get loose. Try not to stress about making it look good or like a person. I think you should start out doing modifed stick figures. What I do with these is simplify the form into a few different important aspects: the head, torso, bottom, joints(knees, elbows, and shoulders) and feets. All the connecting bits to these aspect are represented as lines. I simplify the main aspects into circles and a few triangles.
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