The Boston Athletic Association (BAA) is a non-profit organization founded in 1887, primarily known for organizing the annual Boston Marathon. The BAA promotes fitness and healthy lifestyles through various athletic events and programs, catering to runners of all levels. In addition to the Boston Marathon, the BAA hosts other races, including the Boston Half Marathon and the BAA 5K. The organization also supports youth programs and community initiatives, fostering a love for running and physical activity among participants of all ages.