the reason why the researchers thought he punched with 1000 kg plus force is cos he broke the machine with his punch. and they must have thought that he hit the bag with a punch that the machine could no handle- the limit.
which may have been 1000kg plus.

400 kg is still frightening. this guy is only a light welterweight, a good puncher, not even a 1 punch kayo artist...well he is rarely. the message to the average bloke on the street is, 'u dont wanna get hit by any decent pro boxer!'
the bit that shocked me was the bit about where it said his punch is twice as hard as a premiership football player. now if u wanna imagine how hard this guy hits, then picture this. u gettin kickd in the head by wayne rooney, TIMES 2!

this will obviously give hatton alot of confidence ahead of his title fight against jose luis catillo.

i mean if a light welterweight could hit so hard, then i wouldnt mind knowing how hard a decent heavyweight hit. the average guy would get killed no question!
imagine foreman hitttin one of those machines.