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 UK. First person "race reports" frequently appear on the Dead Runners Society electronic mailing list. Dublin, Ireland's Women's Mini-Marathon is said to be the largest all-female event of its kind in the world. Motivation to be Active For many, competing in a local road race can be the motivation needed for individuals to pursue physical activity. In a study done by the bureau for labor statistics, road running ranked third in the most common form of sport and exercise activity for Americans. Physical Benefit Running on the roads has a different effect on the muscles in the human body opposed to running on the treadmill. Treadmills are made to assist running form due to the way the belt pushes your legs back enhancing movement. Running on the road through various conditions such as hills will do more to strengthen glutes, hamstrings, quads, and smaller muscles in the legs. Additionally, running on the road can help improve bone density as your body breaks down from impact and then regenerates itself. Disadvantages to road running Impact As with any type of running, there is a risk to natural wear and tear on the human body that comes with the different movements required to participate. The difference with road running opposed to other forms is that for long periods of time, a runner will be landing on a harder surface continuously which can lead to various overuse injuries. In any given year, on average 65–80 percent of runners experience some type of injury. In order to decrease the risk of becoming injured from impact on the road, runners can change their shoes every 300–400 miles (500–650 km). The reason that replacing shoes is important for runners is because high mileage shoes have poor shock absorption and worn down tread which can cause pain. Danger One element that is apart exclusively with road running opposed to running in any other location is vehicles that drive by regularly at high speeds. In a study by the company Road ID, it was found that on average 122,000 runners are hit by vehicles and end up in hospitals each year. This figure does not include runners who are hit but do not end up in the hospital. There are different precautions that