Re: I have heard that some people can have the strength of 10 men

Yes, that is a common perception.  I'm not certain if the number '10 men' is 
accurate, but some people when under extreme stress, a psychotic episode, or 
the influence of some drugs can show signs of extreme strength.

In most cases, the person does not become stronger.  The muscles do not 
instantly develop more or thicker muscle fibers.  The amount of actin and 
myosin, the molecules actually responsible for muscle contraction, does not 
increase.  What changes is the person's sensitivity to pain.  There is a 
good chance that I am capable of lifting 650lbs.  But doing so would tear 
muscles, rip tendons and ligaments, and probably even break some bones.  So, 
long before I actually lift the weight, my body sends pain signals to my 
brain causing me to reconsider such a silly idea.

People that I've listed above typically have those pain receptors turned 
off.  A person under extreme stress usually has a high amount of adrenaline 
in their system.  The adrenaline increases the speed and strength of the 
muscles but also reduces the pain felt.  So people under extreme stress are 
capable of feats of strength that they normally wouldn't be able to attempt.  

A similar reaction happens when one is on powerful drugs such as PCP, 
crystal meth, and even crack cocaine.  The person's pain receptors are 
turned off and their psychology is so warped that even if they felt the 
pain, they probably wouldn't even care.  Some police have stated that they 
truly dangerous aspect is that often these people become even more violent 
with the more pain they receive.  I have heard of reports of people fighting 
off many police officers even though both of their arms were broken after a 
car crash.  

Psychotics are typically rather docile.  Psychosis is a mental state in 
which one has little or no relationship to reality.  Basically, they live in 
their own little world.  Usually this means that they are simply unable to 
function in society without the use of powerful psychotropic drugs.  But, 
some of them are quite violent and, unfortunately, many of them end up in 
prison where they recieve little if any medical care.  But, because the 
psychotics brain chemistry is so different from our own, they may not feel 
pain the same was as we do.  Often it takes many people to restrain and 
psychotic when they have a breakdown.  Like those on drugs, they usually do 
not respond to pain normally.