The Ground Pound is a common mechanic in some video games, usually used as an attack that involves your character slamming into the ground. Usually, this attack is visibly more powerful than a character's usual fall would be. Most games don't count landing on the ground as any sort of attack, but a ground pound will definitely do some damage. The problem with this is that in order to "create" more force to slam into the ground with, you must either increase your mass or acceleration downwards. This seems completely unlikely as no character is ever handed a bowling ball at the peak of their jump to increase their mass, and I'm sure nobody's using a jetpack upside down to increase downward acceleration.