Running or jogging to keep fit or competition might seem like a simple sport, but up to 50% of all runners can get some type of injury each year. That injury might be minor and they run through it until it improves or it could be significant enough for them to have to quit running. The most frequent cause of these injuries is that they merely over did the running. They ran too much before the body is given time to adapt or get used to the miles being run. Each time that a load is applied to the body it is very important give it a rest before applying another load by going for another run. If an excessive amount of load is applied before recuperation from a earlier run, any damage get amplified and this might progress into an injury. Rest is just as important as the training runs and that is how fitness and strength is increased and is also how an injury is prevented.
As well as the too much too soon scenario, biomechanics also plays a role. This is the way that we run and different athletes do it differently. Different running techniques can load different tissues in a different way and load some tissues too much, so that when running that may be enough to cause an injury. For example, injuries such asmedial tibial stress syndrome (shin splints) can occur when the width between the foot placement when running is too narrow. Those with this problem may benefit from running with a wider base of gait. Another frequent biomechanical problem in runners is tight calf muscles. When running this causes the mid-foot (arch) of the foot to collapse or flatten and can result in a numerous conditions like plantar fasciitis to runners knee. These runners may benefit the most from a calf muscle stretching program. The treatment of running injury depends on the cause and really should be geared towards that cause, whether its biomechanics to training load issues.