If you're going into some over the top or superhero-ish fight animations and are looking at live action movie references, be aware of cables used to pull actors back after being power punched in the face. When animating always make sure to know where the force is coming from so you can work with a reference like that…
reference, reference, reference. Put together a solid reference video of what you want your fight to look like. put together several videos, cutting up the punches and kicks you want. Even the most exaggerating parts of a fight can still have real life reference. Just gotta find it!