Offensive Lineman are in charge of blocking for the quarterback so he won't get sacked. Or for the running back or fullback so they won't get tackled in the backfield.
Defensive Lineman are in charge of avoiding a block from the offense to make a play in the back field in regards to a sack or tackle for a loss. Some can pick off passes-which means to intercept it.
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The lineman position wise are the guys on the front line basically. Their job (if on offense) is to protect quarterbacks and running backs from defensive lineman and linebackers. The defensive lineman are in charge of getting a tackle of whoever has the ball that isn't on their team.
Definition: The head linesman is the official that sets up straddling the line of scrimmage on the sideline designated by the referee. His duties include: • Watch for line of scrimmage violations like offsides and encroachment
• Rule on all out-of-bounds plays on his side of the field
• Keep tabs on the chain crew
• Mark the chain to a yard marker on the field as a reference point for a measurement on the field
• Mark a players forward progress after a play is whistled dead
• Keep track of all eligible receivers
• Watch for illegal motion, illegal shifts, illegal use of hands, illegal men downfield
A lineman is basically the big guy in the middle, or big guys. They make sure that the offensive line cannot make way for the running back or make room for the quarterback. The will try to sack the quarterback.
Flag football is a non-contact sport, your not really allowed to block, its all about foot speed not physical strength.
He checks whoes throw in it is, if a player is offside, if it is a free kick and if it's a penalty.