maybe show some of the examples you want to emulate, so we can help you figure out what they do?
i vary with showing limbs in action. sometimes, say if a character is waving, i draw the limb in position 1, and slightly less detailed (maybe white lined) in position 2, and then add blur and action lines inbetween, along with this thingy:

like lil icicles on the moving object that kinda act like a motion blur.
other times, i just add some action lines and an impact line, if its like a pat or something. or just action lines for a nod. for a high action hit, id prolly draw the fist (or foot or other offending object) with a lot of foreshortening and an energetic gesture, and then use the blur icicle and impact lines