The Spartans were very good fighters because even the women excercised. They had many wars with other countries because they wanted to take their land and become stronger than they were. Spartans' childern were training because they wanted to become very good fighters. I like this video about Ancient Greece and you should really watch it.
http://ed.ted.com/lessons/this-is-sparta-fierce-warriors-of-the-ancient-world-craig-zimmer#watch
http://ed.ted.com/lessons/this-is-sparta-fierce-warriors-of-the-ancient-world-craig-zimmer#watch