American football
Football games last for a total of 60 minutes in professional and college play and are divided into two-halves of 30 minutes and four-quarters of 15 minutes. High school football games are 48 minutes in length with two-halves of 24 minutes and four-quarters of 12 minutes. The two-halves are separated by a halftime period, and the first and third quarters are also followed by a short break. Prior to the start of the game, the referee and team captains for each team meet at midfield for a coin toss. The visiting team is allowed to call 'heads' or 'tails'; the winner of the toss is allowed to decide between choosing whether to receive or kick off the ball or choosing which goal they want to defend, but they can also defer their choice until the second half. The losing team, unless the winning team decides to defer, is allowed to choose the option the winning team did not select, and receives the option to receive, kick, or select a goal to defend to begin the second half. Most teams choose to receive or defer, because choosing to kick the ball to start the game would allow the other team to choose which goal to defend. Teams switch goals following the first and third quarters. If a down is in progress when a quarter ends, play continues until the down is completed.
Stunt (sport)
Game
Two teams will compete Head to head, involving four quarters and halftime. Halftime is in between quarters 2+3. 
Completion of a Round
This part shows that each round is finalized after the round is scored and announced.
Halftime 
It is a pause of 10 minutes that is given in between 2nd and 3rd quarters of a game. 
Head-to Head
A competition including two people or teams with a similar routine on different sides concurrently. = 
Neutral Zone
It is a midpoint or borderline. The neutral zone is where the officials stand and is defined by 4”extensive white Velcro strips which distinguish the area from proximity mat sections. 
Practice Mats
Practice mats consist of two mat sections and their extent is 6 feet by 42 feet appropriate to teams for warm- up areas in juxtaposition to their team bench.
Quarter Break
Quarter break only consists of two minutes breaks and each player takes in between quarters of play. 
Round
It is duration of time and each team decides 6 pre-arranged procedures for performing. The rounds are divided into three part including quarters 1, 2 and 3. The 4th quarter is related with the performance of each team and involves one round. 
Routine Call
The team with possession will decide the routine which is performed in a certain round.
College STUNT Association/STUNT Handbook/ “STUNT Resources” 2012
http:// www.collegestunting.org. 1 Feb. 2012