[LIBGDX] Hit implementation

Hi, all. I want to implement simple hit from player, but not sure, that my ideas are rational. What’s the best way to implement this?
I’m using libgdx and box2d. Player is rectangular fixture with sprite in it.

When you say “hit from player”, do you mean a collision system (where somthing happens when somthing hits somthing else)?

Well, close to that. I mean that : when user clicks or presses button, hit’s animation plays. And arm, or leg, or whatever, should collide with another body. It’s in real world. But what should collide in game? Fixture of player? Or I had to create boding box, that will represent the hit area?

Found a solution : I should set fixture as Sensor.