The Persistence Backyard Ultra is a challenging endurance race held in Arva, Ontario. Participants run a 6.7056 km loop every hour, repeating until only one runner remains, testing stamina and strategy. This event is affiliated with Lazarus Lake's Big Dog's Backyard Ultra and offers competitors a chance to qualify for this prestigious race.

The course features a 3.36 km loop done twice each hour, comprising crushed stone trails, grass, and dirt roads. To promote community and charity, a portion of registration fees supports the Children's Health Foundation. The race is limited to 65 participants to maintain an intimate, competitive atmosphere.

- 3.36 km loop completed twice per hour to meet distance requirement
- Terrain includes crushed stone trails, grassy areas, and dirt roads
- Designed to test endurance and strategy
- Event limits participants to ensure quality experience

- Run a 6.7056 km loop every hour until a single winner remains
- Affiliated with Lazarus Lake's Big Dog's Backyard Ultra
- Course consists of crushed stone trails, grass, and dirt roads
- Participant cap of 65 runners
- Portion of registration fees donated to Children's Health Foundation