A spartan existence is kind of like being a monk. Your room is bare, you live simply and eat sparingly, and your sheets are probably scratchy.
In ancient Greece, there were two great city states: Athens and Sparta. Athens had the artists, the good food, the great parties. Sparta had the warriors — the guys who went to bed early and drilled all day. They lived in bare rooms and didn’t get sick days or time off. A spartan life is a life of discipline and self-denial. Some people like it like that. Go figure.
unsparing and uncompromising in discipline or judgment
practicing great self-denial
resolute in the face of pain or danger or adversity“spartan courage”
resolutefirm in purpose or belief; characterized by firmness and determination