Who is Spartan competitor?

Could you please elaborate on the term "Spartan competitor"? Are we referring to an individual who participates in modern-day Spartan races, which are known for their challenging obstacle courses and grueling physical demands? Or are we discussing a competitor in a historical or metaphorical sense, perhaps one who embodies the Spartan virtues of discipline, courage, and perseverance? Clarifying the context would help me provide a more accurate description.