Cirencester, Gloucestershire GL7 6JT
Set within the scenic Cotswolds, Tough Mudder South West is truly mesmerizing. Pity you won’t be in a state to notice. With some of the UK’s deepest, darkest mud and soul-crushing terrain, you will sooner think you’ve stumbled into hell. The blurring mixture of polo pitches, large grassy rides and dense forest make it extremely taxing on both the mind and the body.