Starting lineup
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In sports, a starting lineup is an official list of the set of players who will participate in the event when the game begins. The players in the starting lineup are commonly referred to as starters,
Baseball coaches (and umpires) meeting before a game to exchange lineup cards, which list each team's starting lineup and substitutes
Snap (gridiron football)
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A snap is the backward passing of the ball in gridiron football at the start of play from scrimmage.
Starting lineup
…had three starting running backs as well. Center* – The player in the middle of the line of scrimmage. (This player is almost always the player who snaps the ball, although this role by rule can be taken by any player on the line of scrimmage.) Left and right guards* – Lines up on each side of the center…
The center snaps the ball between his legs.
Illustration showing positions of the men just before the ball is passed
Exchange of the snap between the center's legs