Survival training was a required course for Earth Starfleet personnel in the 22nd century. It involved living on recycled sweat and snake meat.
In the early 2140s, Malcolm Reed stopped eating for a whole week, either because of a survival training or for a contest, according to his sister. (ENT: "Silent Enemy")
Charles Tucker and Jonathan Archer completed two weeks survival training in Australia during the 2140s. (ENT: "Desert Crossing")
A.G. Robinson flew to Alice Springs, Australia for survival training in late 2150. (ENT: "First Flight")