Rasselbock Backyard Ultra – Hardwick
–
The Rasselbock Backyard Ultra Harwick starting on 5 September 2026 is based in the stunning grounds of Hardwick Hall Estate in Chesterfield. A Backyard Ultra is a form of ultramarathon race where competitors must consecutively run a 6.71km / 4.16 mile course every hour, on the hour, until there is only one person left standing….