Road running is the sport of running on a measured course over an established road (as opposed to track and cross country running). These events normally range from 5 km to long distance, such as half marathons and marathons, and may involve large numbers of runners or wheelchair entrants. Road running is part of group of road events known as "road races".
Road running may offer those involved a range of challenges and interests such as dealing with hills, sharp bends, varied surfaces, inclement weather, and involvement in a large group. Aerobic fitness, or the ability of the body to use oxygen, is important to help complete the long distance. Anaerobic fitness, the body's ability to respond when there isn't enough oxygen for the muscle, is helpful when encountering hills and providing energy for a sprint at the finish.
Running on roads, rather than dirt or grass, puts some stress on the knees and lower back, though it can provide an easy, even and fast surface, and puts less strain on the Achilles tendon*.
Road races are often community-wide events that highlight or raise money for an issue or project. In the USA, Susan G. Komen's Race for the Cure is held nationwide to raise breast cancer awareness. This race is also run in Germany, Italy and Puerto Rico. Similarly, Race for Life holds races throughout the UK to raise money for Cancer Research.
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