Because the leaders thought that a military society created more obedient and loyal citizens
The Spartans focused on war, fighting and training.
Spartans are usually trained since childhood.
They were trained in military activities.
so they would have the advantage in war.
When they weren't fighting in a war, Spartans were training.
fancy parties, literature, poetry, and athletic training .
Sparta was a militarist state. It laid great emphasis on military training and excellence. The life style of Spartans was simple and rugged. They liked to live a life replete with rigors of military training and enjoyed it.
Spartans were trained from the age of seven. Many would die from the training due to the severe beatings that were given. A Spartan was considered a coward if he showed any fear.
Ancient Spartans did not have any holidays that I know of. If the SPartans were not training they were fighting. If they won in war they would be proud, why celebrate? That is what they thought at least
Because the leaders thought that a military society created more obedient and loyal citizens
They didn't, the armour was made by slaves, called helots. Spartans didn't have time to make armour because they were always busy either fighting in a war or training for a war.
Science and technical training