123455 Run

Running From Wikipedia, the free encyclopedia "Runner" redirects here. For other uses, see Runner (disambiguation). This article is about the type of locomotion in humans. For running in horses, s ee Horse gait. For locomotion in dogs, see Gait (dog). For general locomotion, s ee Gait. For other uses, see Running (disambiguation). A man running in Chicago Runners approach mile 4 of the F^3 Half Marathon in Chicago, 2013 Eadweard Muybridge photo sequence Running is a means of ter of a running body from the viewpoint of spring-mass me chanics is that changes in kinetic and potential energy within a stride occur si multaneously, with energy storage accomplished by springy tendons and passive mu scle elasticity.[2] The term running can refer to any of a variety of speeds ran ging from jogging to sprinting. The ancestors of mankind developed the ability to run for long distances about f our and a half million years ago,[citation needed] probably in order to hunt ani mals. Competitive running grew out of religious festivals in various areas. Reco rds of competitive racing date back to the Tailteann Games in Ireland in 1829 BC E,[citation needed] while the first recorded Olympic Games took place in 776 BCE . Running has been described as the world's most accessible sport.[3] Contents [hide] 2.7 Stride length, hip and knee function 3 Elements of good running technique 2.1 Footstrike 2.2 Midstance 2.3 Propulsion phase 2.4 Swing phase 2.5 Upper extremity function 2.6 Footstrike debate 2.7 Stride length, hip and knee function 3 Elements of good running technique 3.1 Upright posture and a slight forward lean 3.2 Stride rate and types 4 Running injuries 5 Benefits of running 6 Running events 6.1 Limits of speed 6.2 Running speed over increasing distance based on world record times 6.3 Events by type 6.4 Events by distance 7 See also 8 References 9 External links History It is thought that human running evolved at least four and a half million years ago out of the ability of the ape-like Australopithecus, an early ancestor of hu mans, to walk upright on two legs.[4] The theory proposed considered to be the most likely evolution of running is of early humans' developing as endurance runners from the practice of persistence h unting of animals, the activity of following and chasing until a prey is too exh austed to flee, succumbing to "chase myopathy" (Sears 2001), and that human feat ures such as the nuchal ligament, abundant sweat glands, the Achilles tendons, b

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123455 Run