This type of movie is very dangerous to our sociecty.
Later some people learn win chung, and straight try to fighting with boxer, end up jaw broken or brain damage.

In reality, even ip man hand cannot work as shield, the mike tyson punch is too strong, can even break his hand.

Mike tyson single punch produce 1,600 joules of energy.

"So what is it like getting hit by 1,600 joules of Tyson? It'd feel like..."

"Getting hit with a 221lb anvil dropped from 5ft.
Or having Simon Cowell crash into you on a Vespa at nine miles per hour.
It'd feel just like a dorm refrigerator filled with three 12-packs of ice cold beer falling out of a second-story window.
Imagine current Tour de France champion Vincenzo Nibali slamming into you on his bike at 15 mph."

https://www.thrillist.com/culture/how-hard-...and-equivalents