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From Fellrnr.com, Running tips
m
→Running form and cramping
File:RunningForm-M.jpg|Pawback continues
File:RunningForm-N.jpg|The right calf starts to tense in preparation for landing
File:RunningForm-OP.jpg|The right calf absorbs landing forces, working eccentrically File:RunningForm-P.jpg|The right calf and stretches as the leg moves forward and with the foot remains in contact with the ground. The calf will continue to stretch until it reaches the point where the heel comes off the ground.
File:RunningForm-Q.jpg|Right calf contracts to at this point the calf is actively pushing the foot off the ground.
File:RunningForm-R.jpg|Here the sequence begins again with toe off.
