If ya got a dvd player....pause frame by frame as someone walks toward the camera....Draw every 3-4 frames onto paper with rough stick figures....then scan those stick figures into your comp, import them into Flash, and set them as a background so you can trace over your stick figures with your actual character....
I drew some Jackie Chan flip kicks last night....It also helps a bit if the camera in the particular shot of the movie is still....and flip the widescreen function on for height guides (the upper black bar offers a great height line, so you know how close the figure is getting when his head gets closer to that upper bar)...