If you aren't ready to record your own, there are massive libraries of royalty-free body impacts available:
This is the heavy thud or "whump" that follows. It’s packed with low and mid-range frequencies and provides the feeling of weight and scale. body_impacts_sound_effect
A leather jacket or a heavy punching bag provides a perfect mid-range "slap." If you aren't ready to record your own,
To give an impact more "oomph," sound designers often layer in a kick drum or taiko sample with the high frequencies cut off. body_impacts_sound_effect
Sharp, sudden impact sounds can trigger the release of cortisol, increasing the listener's heart rate and alertness.