Editing Running (section)

===Footstrike===
Footstrike occurs when a plantar portion of the foot makes initial contact with the ground.  Common footstrike types include forefoot, midfoot, and heel strike types.<ref name="Daoud 2012 1325–34">{{cite journal|last=Daoud|first=A.I.|title=Foot Strike and Injury Rates in Endurance Runners: a retrospective study|journal= Medicine and Science in Sports and Exercise|year=2012|volume=44|issue=7|pages=1325–1334|doi=10.1249/mss.0b013e3182465115|pmid=22217561|s2cid=14642908|doi-access=free}}</ref><ref>{{cite journal|last=Larson|first=P|title=Foot strike patterns of recreational and sub-elite runners in a long-distance road race|journal=Journal of Sports Sciences|year=2011|volume=29|issue=15|pages=1665–1673|doi=10.1080/02640414.2011.610347|pmid=22092253|s2cid=12239202}}</ref><ref>{{cite journal|last=Smeathers|first=J.E.|title=Transient Vibrations Caused by Heel Strike|journal= Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine|year=1989|volume=203|issue=4|pages=181–186|doi=10.1243/PIME_PROC_1989_203_036_01|pmid=2701953|s2cid=36483935}}</ref> These are characterized by initial contact of the ball of the foot, ball and heel of the foot simultaneously and heel of the foot respectively.  During this time, the [[hip joint]] is undergoing extension from being in maximal flexion from the previous swing phase.  For proper force absorption, the knee joint should be flexed upon the footstrike, and the ankle should be slightly in front of the body.<ref name="Davis 1980 1590–95">{{cite journal|last=Davis|first=G.J.|title=Mechanisms of Selected Knee Injuries|journal=Journal of the American Physical Therapy Association|year=1980|volume=60|pages=1590–1595}}</ref> Footstrike begins the absorption phase as forces from initial contact are attenuated throughout the lower extremity. Absorption of forces continues as the body moves from footstrike to midstance due to vertical propulsion from the toe-off during a previous gait cycle.