The regulation of the Athenian gymnasium is attributed by Pausanias (i. 39. 3) to Theseus. Solon made several laws on the subject; according to Galen these were reduced to a workable system of management in the time of Cleisthenes (late 6th century and early 5th century BC). While the origins of physical exercise regimes cannot be pinpointed, the practice of exercising in the nude had its beginnings in the 7th century BC. The same purpose is frequently attributed to the tradition of oiling the body, a custom so costly that it required significant public and private subsidies (the practice was the largest expense in gymnasia).