If this level is either too high or too low then performance suffers. The ideal zone is right in the middle. This excessive level of arousal leads to increased muscular tension, poor decision making, loss of concentration, and disrupted rhythm and co-ordination. Recognizing and controlling the level of arousal is important to maximize athletic achievement. In addition to regulating arousal these skills have a number of other benefits.
Visualization is a technique in which the athlete imagines performing various tasks.
It deals not only with the visual but also with 'feel'. A runner might, for example, imagine and experience an efficient, smooth stride while running up a long hill. A triathlete might rehearse the sequence of steps required for a quick transition. The imagery should be what the athlete would experience from the first person perspective, not what he would see watching from the sidelines. Centering is a skill which enables the athlete to release unwanted muscular tension, become more body-aware, and control anxiety.