Abstract
In competitive sports, complex movements by athletes can be observed.These movements are highly rationalized and sophisticated, compared to movements in the activity of daily life. They are practised and perfected in order to win. This all too often leads to injury. Stability is defined in various ways, but in this paper, stability and stable movements are defined as movements with the minimum of sports injuries but the maximum of sports performance. Movements that are likely to cause injuries and have a bad effect on performance are defined as unstable movements. The movements seen in running, throwing and tackling are focussed on mechanical factors related to injuries. Points of importance are made with regard to stability.
