Do I have to intentionally rotate my body when throwing a cross punch?

[amateur]

When a mosquito flies over your head and you use both hands to smash it, your hands will go first and your body will follow afterward. That's for speed.

Why would you smash a poor mosquito?

 

[Kung Fu Wang104]

Why would you smash a poor mosquito?

It's an example that in fighting sometime speed can be more important than power. A 10 lb force that land on your opponent's eyes can cause as much damage as a 100 lb force can.

 

[pdg]

Why would you smash a poor mosquito?

Because self defence, obviously.

 

[Dirty Dog3]

Why would you smash a poor mosquito?

Mosquitoes are the most dangerous animal in the world.