Ultra Challenge The Ultra Challenge Series offers a range of events at various dates and locations throughout the year. High quality endurance style events to take on at your pace, for a wide range of fitness levels, ages & experience. For teams & individuals, choose to fundraise for us – and achieve something special. No obstacles or mud pools, just wonderful British scenery, full support all the way, lots of food & drink, camaraderie, and your spirit, determination & sense of adventure! With 14 events, 3 distance options, and a few 10 km ‘tasters’ – there’s an Ultra Challenge® for everyone! Register today and fundraise for Colchester & Ipswich Hospitals Charity! Sign up! Manage Cookie Preferences