Running is a natural part of human locomotion and humans have been running for million of years. In modern society, running has become a popular way of exercise and is undertaken by many people worldwide, possibly because it provides a cheap and easily accessible form of exercise, and the positive effects of running on health and fitness are well known. Unfortunately, running is also associated with a high risk of injury.

The purpose of this project is to investigate how a running schedule which focuses either on running distance or running speed influence the overall risk of injury and the types of injury sustained in recreational runners.

Trails directed at investigating differences in injury risk in relation to the focus of the running schedule have been conducted without any firm conclusions. People engaged in recreational running or choosing running as a new and active lifestyle needs guidance on which running schedules minimize the injury risk, aiding their chance of an active lifestyle and possibly reversing the increase in people developing a lifestyle disease. To develop running schedules minimizing the risk of injury, an understanding of the mechanisms that the different training variables impose on the human body is necessary. The existing literature on running intensity and the development of injuries show conflicting result. More studies are necessary to ascertain if there is a relationship between the intensity of running. In such studies, it is important to include other training variables in the analysis and to quantify running exposure using an objective method of measuring the relative intensity and absolute volume.

Inclusion Criteria:

• on average 1-3 weekly running sessions the past 6 months
• owns a pair of running shoes
• internet access and mail address
• owns a Garmin GPS watch (pulse rate watch) or an IPhone/Android phone

Exclusion Criteria:

• previous injury in lower extremity within the past 6 months
• unable to follow the running regime in 6 consecutive months
• do not want to use GPS (Global Positioning System) watch or Android/Smart phone to register training
• unable to read or understand Danish
• deprecated by personal GP (General Practitioner) to run due to former surgery or physical disease
• mental condition that does not allow participation (e.g. externalizing behaviors, dementia)
• pregnancy
• participants with blood pressure above normal according to WHO guidelines will need to consult own GP (General Practitioner) for approval