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From Fellrnr.com, Running tips
Cramps
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File:RunningForm-R.jpg|Toe Off from right (red) leg
File:RunningForm-S.jpg|The right calf should be relaxed from this point until just before the foot touches down
File:RunningForm-AB.jpg|Foot extends passively (without any active calf contraction) as the leg is pulled forward File:RunningForm-B.jpg|Right calf relaxed
File:RunningForm-C.jpg|Right calf relaxed
File:RunningForm-E.jpg|Right calf relaxed
File:RunningForm-G.jpg|Right calf relaxed
File:RunningForm-H.jpg|Right calf relaxed
File:RunningForm-K.jpg|Right calf relaxed
File:RunningForm-L.jpg|As the right leg decelerates for pawback, the momentum of the foot will cause it to come up towards the shin, stretching the calf slightly.
File:RunningForm-N.jpg|The right calf starts to tense in preparation for landing
File:RunningForm-P.jpg|The right calf absorbs landing forces, working eccentrically and stretches as the leg moves forward with the foot in contact with the ground. The calf will continue to stretch until it reaches the point where the heel comes off the ground.