Running might sound like a easy exercise to take up to improve fitness. However, it is not quite as straightforward as it might seem with some research showing that up to 70% of runners have an overuse injury each year. Depending upon how bad that overuse injury is and just how it is managed, many runners just give up and don't continue to run. The reasons behind running overuse injury are multiple but they are linked to problems such as carrying out too much running too quickly before allowing your body to adapt to the increased degrees of activity. Bad running footwear with characteristics that do not match up with those of the runners requirements will also be a factor. Complications with foot biomechanics and also the running technique can also be issues at raising the chance for an injury.
A good example of an overuse injury is anterior compartment syndrome. There is fibrous fascia around muscles that contain the muscles in place. If that fascia is tight, once we exercise the muscle will need to expand but that tight fascia inhibits it. That pressure within the fascia compartment might be painful. In anterior compartment syndrome, this involves the muscles in the front of the leg. The most common cause of this condition is what is known as overstriding. In this the runner is striking the ground with their front leg too far in front of the body. To lower the foot to the ground, the anterior leg muscles need to work harder. As they continue to work harder, the muscles expand and if the fascia isn't going to allow it, then this results in being painful. It is going to only be painful when running and won't be painful when not running. The simplest way to deal with this problem to use techniques for the runner to shorten their stride length so that the lead foot does not make contact with the ground too far ahead of the body when running.