Race Format Guides

Learn how different endurance race formats work — the rules, distances, and history — then find an event near you.

• What Is a Backyard Ultra?

  A backyard ultra is a last-person-standing race: a 4.167-mile loop every hour until one runner is left. Learn the rules, history, and find a race near you.

• What Is a Try-A-Tri?

  A Try-A-Tri is the entry-level triathlon for first-timers: a short swim, bike, and run, often with a pool swim. Learn what to expect and find a race near you.