This is UK's greatest endurance challenge. Whether you are a walker, jogger or runner, this challenge will suit you all. This is a 100 km route, consiting of paths and trails, finishing through Brightons racecourse. The mental health charities you can fundraise for are; Mind, CALM, Mental Health Research UK. You can also run for charities that aren't listed on their website, for example YoungMinds or Best Beginnings.