ascetic
noun.
someone who practices self denial as a spiritual discipline
Synonym: abstainer
adj.
pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline
ascetic practices
Synonym: ascetical
adj.
practicing great self-denial
Be systematically ascetic...do...something for no other reason than that you would rather not do it|a desert nomad's austere life|a spartan diet|a spartan existence