The 5K run is a long-distance road running competition over a distance of five kilometres (3.1 miles). Also referred to as the 5K road race, 5 km, or simply 5K, it is the shortest of the most common road running distances. It is usually distinguished from the 5000 metres track running event by stating the distance in kilometres, rather than metres. Among road running events, the 5K distance is mostly popular with novice or infrequent runners or joggers, as it is comparatively easier to complete the distance without endurance training. This also makes the distance suitable for people looking to improve or maintain their general physical fitness, rather than develop long-distance running abilities. The brevity of the distance means that less time is required to take part in the activity and that people from a wide range of ages and abilities may participate. From a physiological perspective, five kilometres is towards the low end of endurance running. The combination of the activity’s simplicity, its low-cost, and medium exercise intensity mean that it is often recommended by medical organisations and healthcare professionals. Like all physical activity, regular 5K runs can improve cardiovascular function and reduce body fat, as well as having mental health benefits (see runner’s high).