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In American football, two-a-days occur when a team or individual trains on two occasions during the same day. Two-a-days are used primarily to get in shape for the season, and learn new strategies.
In the National Football League, two-a-days were eliminated in the 2011 collective bargaining agreement. Previously, teams ran double sessions and sometimes triple sessions for several weeks during the pre-season. Those practices are called training camp, and most teams travel to distant locations to hold their preparations.