How fast can they swim? In a 25-meter pool, elite French open water swimmers swam for over 3 miles in a hour. Professional marathon swimmer Aurélie Muller covered 5377.75 meters or 3.34 miles in an hour. World championship representative (in the 10 km and 25 km event) Axel Reymond (shown on left) covered 5784.15 meters […]