A relatively high intensity, relatively long duration form of training in which a distance or middle-distance athlete works at about 80–85% VO2max (i.e. at about race pace or just below). This type of training is psychologically demanding. It also puts considerable stress on the bones and joints. Too much reliance on long-fast duration training can lead to overuse injuries, but used properly, it can provide greater improvements than long-slow duration training (see LSD training). A typical session of long-fast duration training for a good middle distance runner would be 5 miles (8 km) at 5:30 per mile pace (about 3:15 per km).
Subjects: Sports and Exercise Medicine.