Also, remember science and more importantly- physics. Ya know, gravity and energy exertion. When a character falls over, they don’t just stop, they bounce a bit (makes good use of the ‘body fall’ sound effect). Another thing is when someone either punches, kicks, head butts, whatever. The harder/stronger the attack, the more build up and cool down you’ll need to make it look like it took some real effort into the attack.
There’s an animation called DMLan VS Empress Roux on my Youtube channel, it’s got a few good examples like when Roux slams into a tree but jolts from the inpact.