Work starts for Chargers, Chiefs

The AFC West march to the 2013 NFL season starts Monday when the Kansas City Chiefs and the San Diego Chargers begin their offseason workout programs.

Teams with new coaches -- Andy Reid takes over in Kansas City and Mike McCoy is the new boss in San Diego -- can start their offseason programs early.

Offseason workout programs for teams with new coaches can run for nine weeks within a 12-week period. The other teams have a 10-week window with which to get in nine weeks. The programs cannot exceed four days a week and must be conducted Monday through Friday. Offseason workout programs have three phases with different rules for each. They are based on strength and conditioning, individual instruction and organized team activities.

The Denver Broncos and Oakland Raiders start their offseason programs April 15. All of the teams will have mandatory minicamps in June. Training camps start in later July.

Monday, in Kansas City and in San Diego, at least, the 2013 season is beginning.