The Arch2Arch is an ultra-triathlon from London to Paris. You start by running 140km through London, then swim across the English Channel (~34km), and finish with a 300km bike ride into Paris. The Channel crossing is weather-dependent — my window is August or September 2027.
November 10, 2026. Half the distance of the full Arch2Arch — a critical test of fitness, logistics, and mental readiness before the main event.