Big's Backyard Ultra is the World Championship of backyard ultrarunning, in which competitors must run a 4.167 mile / 6.7 kilometre loop every hour on the hour until only one runner remains. The format allows all genders to compete on an equal basis. The 2019 World Champion, Maggie Guterl covered 250 miles / 400 kilometres in 60 hours.

Owing to the COVID-19 pandemic Big's Backyard Ultra 2020 was a held symultaneously across 21 countries, coordinated through a single online meeting. Each country would hold a separate backyard event with a maximum of 15 runners; the aggregate number of laps or "yards" counting for the world team championship.

Shaun "Runningbeast" Collins, Dr. Katie Wright, Fiona Hayvice and Andrew McDowall would compete as part of the New Zealand team. They are their team mates are enormously experienced ultra-endurance athletes, but who would be the last runner standing?