The tribes of the northern Barbarians are a nomadic people, roaming the vast open plains of the Northern Steppes. Being raised in this environment has strengthened the Barbarian people. Simply by looking at a member of the northern clans, you can tell that they are more hale and hearty than the average person. Such is their vigor! Through strict conditioning, the Barbarian warriors can train their bodies to endure tremendous physical exertions, and be ready for battle in a moment's notice.
↑Diablo II Manual, page 67. Blizzard Entertainment, 2000.