Designed to Run - The Amazing Gait Cycle
Human beings are remarkable endurance runners. Although we are not the fastest animals over short distances, our anatomy and physiology allow us to travel efficiently over long distances by coordinating the movements of the feet, ankles, knees, hips, pelvis, trunk, and upper body.
Running is more than a sequence of muscular contractions. With every stride, the body must absorb force, maintain balance, support body weight, propel itself forward, and prepare for the next ground contact. Muscles, tendons, fascia, joints, and the nervous system work together to accomplish these tasks within fractions of a second.
One of the most fascinating features of running is our ability to store and return elastic energy. During ground contact, structures such as the Achilles tendon and other elastic tissues deform under load and temporarily store energy. A portion of that energy can then be returned during propulsion, contributing to the spring-like behaviour of running and reducing the muscular work required to maintain movement.
Running also differs fundamentally from walking. During walking, at least one foot remains in contact with the ground. Running introduces a flight phase, during which neither foot touches the ground. As running speed changes, so do ground-contact time, stride length, cadence, joint motion, muscular demands, and the forces the body must manage.
Understanding these interactions is particularly important for healthcare practitioners working with runners. Gait analysis should not be reduced to identifying a single “ideal” foot strike, posture, or running technique. Running biomechanics vary considerably between individuals, and differences are not necessarily dysfunctions. The more useful question is whether a runner has the strength, mobility, coordination, and tissue capacity required to tolerate the demands of their particular running style, training volume, terrain, and goals.
In this article, we will break the running gait cycle into its major components, examining the stance and swing phases, how forces are absorbed and generated, and how elastic energy contributes to efficient locomotion. Understanding these principles provides a foundation for evaluating running mechanics, rehabilitation, and performance.
Article Index:
Introduction
Running is a coordinated interaction between the entire body, with the feet, legs, pelvis, trunk, and upper body working together to absorb force, maintain balance, and generate forward propulsion.
One of the fundamental differences between walking and running is the presence of a flight phase. During walking, at least one foot remains in contact with the ground. During running, there are periods when both feet are airborne. As running speed increases, ground-contact time generally decreases and the demands on the body's muscles, tendons, and other elastic tissues increase.
This is where energy storage and elastic recoil become particularly important. When the foot contacts the ground, muscles and tendons absorb and temporarily store mechanical energy. A portion of this energy is then returned during propulsion, contributing to the spring-like efficiency of running.
From an evolutionary perspective, this ability to move efficiently over long distances provided important advantages for human survival. Today, the same remarkable system allows us to run for transportation, recreation, competition, and simply for the enjoyment of movement.
Made to Run
Our capacity for endurance running also has deep evolutionary roots. At the Fifth International Fascia Congress in Berlin in 2018, I had the opportunity to attend a lecture by Harvard evolutionary biologist Dr. Daniel E. Lieberman, whose research has explored the role of endurance running in human evolution.
Humans may not possess the raw speed of many other animals, but we have evolved a remarkable combination of characteristics that support sustained locomotion over long distances. From our upright posture and long lower limbs to our ability to dissipate heat and use elastic tissues during running, movement has played an important role in our evolutionary history.
Modern life may require far less running than the environments in which these characteristics evolved, but the underlying capacity remains. Understanding how that system works gives us a fascinating window into both human movement and the biomechanics of running.
The Running Gait Cycle
Watch an experienced runner in motion and the movement can appear almost effortless. Underneath that apparent simplicity, however, an extraordinary sequence of events is taking place. With every stride, the body must accept load, absorb and redirect forces, maintain balance, store elastic energy, propel the body forward, recover the limb, and prepare for the next contact with the ground.
And it happens again and again, thousands of times during a run.
A complete running gait cycle begins when one foot contacts the ground and ends when that same foot contacts the ground again. Although we divide this cycle into phases to study it, running is not really a collection of isolated movements. Each phase prepares the body for what comes next.
At its simplest, the running gait cycle can be divided into two major phases:
Stance Phase: the period when the foot is in contact with the ground.
Swing Phase: the period from toe-off until that same foot returns to the ground.
Running also contains something walking does not: a flight phase, when neither foot is touching the ground.
For practitioners, understanding these phases provides a framework for gait analysis. The objective is not to force every runner toward an identical technique. Instead, we can ask more useful questions: How is the runner accepting load? Where is movement occurring? How are forces being transferred through the kinetic chain? Does the runner have the strength and capacity required for those demands?
That is where biomechanics becomes clinically useful.
The Stance Phase Of Gait
The stance phase begins the instant the foot contacts the ground and ends at toe-off. Although terminology varies between biomechanical models, it can be useful clinically to consider three broad stages:
Initial Contact and Loading
Midstance
Propulsion and Take-Off
During this relatively brief period, the lower extremity must perform two seemingly opposite jobs. It must become compliant enough to accept and manage load, while rapidly transitioning toward the stiffness required to generate and transmit force for propulsion.
Initial Contact
Initial contact is the runner's first interaction with the ground during each stride.
The foot may contact the ground with the rearfoot, midfoot, or forefoot. There is considerable normal variation between runners, and foot-strike pattern alone does not determine whether someone is running correctly or incorrectly.
What matters biomechanically is what happens to the forces generated at contact.
As the body moves over the supporting limb, coordinated motion occurs throughout the foot, ankle, knee, hip, pelvis, and trunk. Depending on the individual runner and foot-strike pattern, this may include ankle motion, subtalar pronation, tibial rotation, knee flexion, and hip movement, all contributing to the management and redirection of load.
Pronation is therefore not inherently a problem. It is a normal component of human locomotion. The clinically relevant questions are how much movement occurs, when it occurs, how quickly it occurs, and whether the runner has sufficient capacity to control the forces involved.
Foot placement also influences braking forces. Landing substantially ahead of the body's centre of mass can increase the braking impulse in some runners, but there is no single ideal point of contact that applies to everyone. Running speed, cadence, leg length, footwear, terrain, fatigue, and individual anatomy all influence the way a runner meets the ground.
This is an important principle that will appear repeatedly throughout our discussion of running biomechanics:
Variation is not automatically dysfunction.
Midstance
As the runner progresses into midstance, the body moves over the supporting limb and the lower extremity experiences substantial loading.
Ground-reaction forces during running can reach several times body weight, depending on speed, running style, surface, footwear, and other factors. The body does not simply “absorb” these forces. It manages and redirects them through coordinated muscular activity, joint motion, and deformation of elastic tissues.
This is where the spring-like properties of the human body become particularly important.
The Achilles tendon, plantar structures, muscles and tendons of the lower extremity, and other connective tissues can temporarily store mechanical energy as they are loaded. Some of that energy can subsequently be returned as the runner moves toward propulsion.
At the same time, the hip and trunk help control the position of the pelvis and lower extremity. The gluteal muscles, quadriceps, hamstrings, calf complex, intrinsic and extrinsic foot muscles, and trunk musculature all contribute to controlling movement and preparing the body for the next phase.
Rather than thinking about a single muscle doing a single job, it is more useful to see running as a continuously changing coordination problem involving the entire kinetic chain.
Propulsion and Take-off
As the body's centre of mass moves ahead of the supporting foot, the lower extremity transitions from accepting load toward generating propulsion.
The ankle moves toward plantarflexion, the knee extends, and the hip progresses into extension as the body advances forward. At the foot, increasing stiffness helps create an effective platform through which forces can be transmitted.
The Achilles tendon and calf complex play particularly important roles during this phase. Energy stored during loading can contribute to propulsion as elastic tissues recoil, while muscular contraction supplies additional force.
This interaction between active muscular work and passive elastic energy storage and return is one of the defining characteristics of running.
Take-off is therefore not simply a matter of “pushing harder.” Efficient propulsion depends upon timing, coordination, tissue stiffness, strength, running speed, and the runner's ability to transition rapidly from loading to force production.
Then something remarkable happens.
The runner leaves the ground.
The Swing Phase Of Gait
Once the foot leaves the ground, the swing phase begins. The limb must now recover from behind the body, move forward, and prepare for the next ground contact.
For clinical analysis, the swing phase can again be divided into three broad stages:
Initial Swing
Mid Swing
Terminal Swing
The leg is no longer supporting body weight, but this does not mean it is inactive. Precise coordination is required to reposition the limb efficiently while the opposite leg manages the stance phase.
Initial Swing: Swing Phase
Initial swing begins immediately after toe-off.
The hip begins moving into flexion and the knee flexes, effectively shortening the limb and allowing the foot to clear the ground. The leg that has just generated propulsion now transitions rapidly into recovery.
During running, both feet are also off the ground at the same time. This flight phase is one of the biomechanical characteristics that distinguishes running from walking.
As running speed increases, the relationship between stance time, swing time, cadence, stride length, and flight time changes. Sprinting, distance running, jogging, and uphill or downhill running therefore place very different demands on the body.
Mid Swing: Swing Phase
During mid swing, the thigh continues moving forward while the knee begins to extend, positioning the lower leg for the next contact.
Pelvic rotation and movement of the trunk and opposite arm contribute to the coordination of the stride. Rather than viewing these movements as unwanted compensations, many are normal components of running that help manage angular momentum and coordinate whole-body movement.
The clinical question is not whether movement exists, but whether the runner can control that movement repeatedly under the demands of running.
Strength, mobility, coordination, running speed, fatigue, previous injury, and training history can all influence what we observe.
Terminal Swing: Swing Phase
Terminal swing is the final preparation for ground contact.
As the thigh approaches the end of its forward motion, the knee extends and the hamstrings become highly active as they help control the rapidly moving lower leg. The hip musculature also prepares the limb for the forces that will arrive at contact.
This phase demonstrates an important principle of running biomechanics: preparation for impact begins before the foot reaches the ground.
The nervous system anticipates contact and adjusts muscular activity and limb stiffness accordingly. The runner is not simply reacting to the ground. The body is preparing for it.
Then the foot contacts the ground and the cycle begins again.
Running Is a Cycle, Not a Collection of Parts
Dividing running into phases helps us understand it, but we should never lose sight of the larger picture.
Foot motion influences tibial motion. The knee interacts with the hip. The pelvis interacts with the trunk. The arms contribute to whole-body coordination. Muscles generate force while tendons and other elastic tissues store and return energy. The nervous system continually adjusts all of these elements according to speed, terrain, fatigue, previous experience, and the task at hand.
This is why gait analysis should go beyond looking for a single abnormal movement.
For practitioners, the challenge is to determine whether what we observe represents normal individual variation, an adaptation to the demands of running, or a finding that may be clinically relevant to pain, injury, or performance.
That distinction is fundamental.
And it provides the foundation for deeper discussions of foot strike, cadence, ground-reaction forces, pronation, running economy, strength, mobility, injury rehabilitation, footwear, and performance.
Those are the layers we can begin to explore once we understand the gait cycle itself.
References
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DR. BRIAN ABELSON DC. - The Author
Dr. Brian Abelson is a chiropractor, author, and educator with more than 30 years of clinical experience in musculoskeletal care, rehabilitation, and sports performance. His educational work focuses on musculoskeletal conditions, human movement, sports biomechanics, and evidence-informed approaches to treatment and rehabilitation.
He is the developer of Motion Specific Release (MSR) and Clinical Director of Kinetic Health in Calgary, Alberta, Canada.
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