That Dam Hill presents a distinctive challenge for runners, featuring London's sole timed ultra marathon and serving as a Boston Marathon Qualifier. Managed by passionate volunteers, all net proceeds support cancer research, contributing to over $1.2 million raised by Dunn with Cancer, while also aiding various charitable partners in their fundraising efforts. Despite its name, the hill is more of a gentle incline, making this an excellent choice for athletes seeking a certified course that’s friendly for spectators. The race combines a rewarding run with the satisfaction of supporting a great cause, appealing to those aiming for an impressive marathon experience.