<Tr> <Td> </Td> <Td> This section possibly contains original research . Please improve it by verifying the claims made and adding inline citations . Statements consisting only of original research should be removed . (January 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> The teams organize each other at the beginning of the game; if there are no pre-selected teams, a draft is held on the spot from the available players . In the event of an odd number of players, one player will usually serve as an "all time quarterback," who plays on offense the whole game and cannot run the ball past the line of scrimmage, or, if more players are on their way, the team who is short handed will automatically draft the newcomer upon arrival . </P> <P> The two teams organize on opposite sides of the field for the kickoff . Because of skill, field size and other issues, this is usually not a kickoff but rather a punt - off or a throw - off . Many versions skip this process and start the offense at a certain point, similar to a touchback in NFL or other national leagues . </P> <P> As in regular American football, each team usually has four downs per series . In order to achieve a series of downs, backyard football requires the team with the ball to complete two passes or reach a certain point on the field . Few games include enough people to run a chain crew to maintain the 10 yard familiar in most organized leagues . These structures encourages passing plays over running, as does the usual lack of offensive and defensive lines . Play continues until there is a turnover on downs (i.e. the offensive team fails to complete two passes in four downs), an interception occurs, or the team on offense scores a touchdown . Touchdowns are worth 6, 7, or 1 point (s) depending on the rules set out before the game . </P>

Recovering a fumbled ball is the main cause of football injuries