Yes you can, as long as you don't grab onto their face mask.
No, it's not illegal.
Yes it is. Some may claim that it is a offensive foul, but one can 'stiff arm' the defender to a certain degree. The refs will call it if the 'stiff arm' was somehow unfair or too much.
It's definately possible.. Legal? Who cares its worth it
Because he doesn't put his hand on the face mask of the defender.
for football no but if you grab and hold yes
It is a short, gray, stiff hair.
stiff arm
no, that would be considered warding
A stifff arm is the name of a move a football player does to defend the football (it's always the player that's running with the ball). While he has the ball in one hand, the other arm sticks out and stiffens, hence the name stiff arm. By doing so, it appears as if he is commanding the person to stop, and this creates distance between the ball and the defender, making it harder for the defender to get the ball.
Accuracy - Colt McCoy, Texas - 78% Season in the 2008 season (record). Throwing Distance: Sam Bradford, Oklahoma.
It's only fashion. http://www.nytimes.com/2008/09/18/sports/football/18bands.html
Arm Strength