So I'm a linebacker. Have you ever been one?
No I'm a girl so we dont typically play football but I do love watching and my husband was a Middle Linebacker in college!
Neat! A linebacker is a position in American and Canadian football. Lots of teams have one (and it can be pretty rough)
Are they an offensive or defensive position? 
Linebackers are members of the defensive team three to five yards behind the scrimmage line!
How many linebackers are typically on the field at one time?
3 or 4 depending. Linebackers are required to use their judgement to determine their roles during the game
It sounds like it would be really hard.