4×10K

4x10K refers to a relay race in swimming where four swimmers each swim a 10,000-meter distance. This is a highly demanding and endurance-focused event. The total distance of the race is 40,000 meters, or 40 kilometers. This type of event is typically found in ultra-marathon swimming competitions rather than standard pool or open water events. It requires exceptional physical stamina, mental fortitude, and a well-trained support crew. The race is usually conducted in open water environments, such as lakes or oceans, due to the extreme distance. Due to its length, it is not a common Olympic or World Aquatics Championship event. Instead, it is more likely to be part of specialized ultra-endurance challenges or record attempts. The logistics of a 4x10K relay are significant, involving synchronized swimming efforts, feeding strategies, and safety protocols over an extended period. The swimmers must maintain a consistent pace and manage their energy reserves effectively to complete the immense distance.