Guardian Travel readers shared favourite organised challenges that combine demanding terrain, strong support and memorable local culture, from long-distance cycling and marathons to swims, treks and charity abseils. Cycle the Tour de France route: Riders praised Ride Le Loop for logistics, encouragement and team spirit on a full-tour ride. The

Guardian Travel readers shared favourite organised challenges, highlighting well-supported events that combine scenery, camaraderie and clear logistics. One rider praised undertaking the full Tour de France route with Ride Le Loop, saying strong staff support and encouragement made tough climbs unforgettable. Riders can also tackle individual stages; the next trip