Running

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http://www.runnersworld.com/running-tips/stride-drills-can-help Over years of running, inefficiencies can creep into your stride. Often, an injury changes the way you run. Or maybe one leg has become stronger than the other for some reason, or you've started swinging your arms across your chest too much. Stride drills can help. Most world-class runners do some sort of stride drills after their daily workouts.

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http://www.brianmac.co.uk/lactic.htm

Lactic Acid

The expression "lactic acid" is used most commonly by athletes to describe the intense pain felt during exhaustive exercise, especially in events like the 400 metres and 800 metres.