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[[File:CC-Track and field stadium.jpg|right|thumb|300px|The oval track is where many runners do their interval training. Photo by [http://www.flickr.com/people/eijakristiina/ eijakristiina].]]
== Injury prevention ==
Any problems you have with your biomechanics ([[Running Form|running form]]) will often be exacerbated by running faster. It is very important to start [[Interval Training|interval training ]] by running at a lower than ideal intensity until you get used to the faster pace. Many runners try to increase their stride length by reaching forward with their leading leg. This is called 'over striding' and involves the foot landing in front of the hip, rather than directly underneath the hip. This acts as a jarring brake, and sends a shock wave up the leg and through the body.
When first doing intervals, concentrate on running lightly and efficiently. Your [[Cadence|cadence]] should remain high (see tip #1, cadence) and you should listen to your feet; any slapping sound is a bad sign!