# If you get punched, is it better to be lighter or heavier?

I've seen people argue that lighter people can take a punch better because they can "go with it" better.

This seems plausible to me, but is it really true?

One reason why it seems plausible is that indeed, if you are heavier, you will move back slower as a result of the punch, which means that the fist is also moving slower as you are going back; this means that more of the kinetic energy of the first was absorbed by your body.

• Athletes (boxers etc.) who take punches well don't do it acting as passive targets; they use techniques such as rolling and slipping to avoid taking the full force of the punch. And if the target is very heavy, i.e., the ratio $M_{target}/M_{puncher} \rightarrow \infty$ the target is not going to be affected much, right? – Maxim Umansky Apr 24 at 6:08