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From Fellrnr.com, Running tips
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* '''Braking G's'''. Ideally your foot will travel in front of your body, then you will "paw back" so that when it touches down your foot should be moving backwards in relationship to your body and fairly stationary in relationship to the ground. Without this paw back, you are likely to suffer from [[Overstriding]] and the impact with the ground will results in braking G's. RunScribe suggest Braking G's are in the range 4-13 G's, and lower is defiantly better.
* '''Impact G's'''. The impact when your foot lands is measured by RunScribe, but it's not clear what this value means. [[The Science of Running Shoes]] does not support the idea that higher impact results in higher injury rates, and there's some evidence to the contrary. RunScribe suggest Impact G's are in the range 5-15 G's.
* '''Foot Strike'''. RunScribe gives a numeric value for [[Foot strikeStrike]], with 0-6 s heel strike (Rear Foot Strike or RFS), 6-10 as Midfoot Strike (MFS), and 10-15 being Forefoot Strike (FFS). The best [[Foot strikeStrike]] pattern is both controversial and unclear, but it seems likely that extreme RFS is probably an indication of [[Overstriding]].
* '''Ground Contact Time'''. Naturally this is how long your foot is on the ground rather than in the air. The [[The Science of Running Economy]] indicates that longer Ground Contact Time costs more energy (reduced [[Running Economy]].)
* '''Pronation'''. Most runners will land on the outside of their foot and then the foot will roll inwards. This roll, called [[Pronation]] is sometimes thought of as a bad thing, especially in excess. [[The Science of Running Shoes]] does not support this belief, but Pronation can be measured by RunScribe in several ways.
