Political history of Sri Aurobindo
Anushilan Samiti was founded as an attempt to organize Bengali youth through a program of physical fitness and spiritual training for a nationalist program. By 1902, Calcutta had three societies working under the umbrella of Anushilan Samity, a society earlier founded by a Calcutta barrister by the name of Pramatha Mitra. These included Mitra's own group, another led by a Bengali lady by the name of Sarala Devi, and a third one led by Aurobindo Ghosh. The Anushilan Samiti had Aurobindo and Deshabandhu Chittaranjan Das as the vice-presidents, Suren Tagore the treasurer. Jatindra Nath Banerjee (Niralamba Swami), Bagha Jatin, Bhupendra Nath Datta (Swami Vivekananda's brother), Barindra Ghosh were among other initial leaders.
By 1905, the work of Aurobindo and his brother Barin Ghosh allowed Anushilan Samity to spread through Bengal.
Hindu nationalism
Anushilan Samiti was one of the prominent revolutionary movements in India in the early part of twentieth century. It was started as a cultural society in 1902, by Aurobindo and the followers of Bankim Chandra to propagate the teachings of the Bhagavad Gita. But soon the Samiti had its goal to overthrow the British rule in India. Various branches of the Samiti sprung across India in the guise of suburban fitness clubs but secretly imparted arms training to its members with the implicit aim of using them against the British administration.