Proper Running Form | Quick Tips For Running Gait Assessment
Proper running form and quick tips for running gait assessment is not only important for distance running and trail running but running of all types. Whether you are training for a marathon, half marathon, 10k, 5k, or even shorter race you will find value in this post.
This post covers overstriding and how to determine if you overstride. It also covers vertical displacement and what too little or too much vertical displacement looks like.
If you are more interested in seeing a video on this topic, you can check out our YouTube channel here:
What is Overstriding?
There are different opinions about what a “true overstride” is. This is how we simply it. Overstriding is when your initial contact (the moment your lead foot hits the ground) is out in front of your knee (see image 1). Often this causes your initial contact to be far from your center of mass (see image 1). It often looks like the runner is “reaching” with their foot as they run. It can also lead to a very pronounced rearfoot strike.
Image 1. Overstride
A rearfoot strike is not necessarily a bad thing… but we will discuss that another time.
Overstriding however, does increase stress through your ankles, knees, hips, low back, etc. It can increase your breaking force, decrease your efficiency, and lead to injury. Needless to say overstriding is not great for a runner.
What does it look like to not overstride?
A good stride occurs when the runner contacts the ground with there foot underneath their knee (their shin bone is perpendicular to the ground). This helps to decrease stress on the runners body and provides for more efficient propulsion forward. This often causes the runners initial contact to be closer to their center of mass. Image 2 is a good example of a good stride.
Image 2. Good stride
Why does Overstriding happen?
There are many reasons why a runner may overstride. Here are a few:
The runner is fatigued and trying to maintain the same speed.
The runner has ingrained a pattern of running into their nervous system that leads to overstriding.
The runner has specific muscle tightness or weakness that is leading to this gait fault.
Important Distinction: Overstriding IS NOT just having a long stride. You can have a long stride and NOT be overstriding. Some of the best runners in the world have a very long stride length, but most do not overstride. Speed = stride length x cadence (step rate). So while overstriding is not good, a long stride length can be very good for improving your speed.
Is understriding a big deal?
Understriding can be a big deal! Understriding happens when a runner does not take a long enough stride. This can look like the runner is almost walking instead of running. Their foot will land too close to their body and they will not be propelling themselves forward as effectively. It will result in decreased speed and running efficiency but may not be an important factor when talking about injury risk.
How do I avoid overstriding or understriding?
Stay tuned for our next post on this topic :)
What is Vertical Displacement?
Vertical displacement is the height difference between a runner's center of mass at their lowest point in the gait cycle (mid stance) and the highest point in the gait cycle (mid flight).
Why is vertical displacement important?
This may seem basic, but the goal of running is to propel yourself forward. Vertical displacement is propelling yourself upward. It is completely necessary to have vertical displacement because otherwise you will not get ground clearance and will not effectively move forward. However, too much vertical displacement can result in wasted time and energy moving the body upward instead of forward. Too little vertical displacement results in decreased push off and propulsion forward.
Excessively high vertical displacement looks like the runner is bounding or jumping with each stride. It results in a greater distance between the runners center of mass at their lowest and highest point (see image 3 - we use the top of the runner’s head when estimating this because it is easier to see… the runners center of mass will generally be closer to their pelvis or belly button).
Image 3. High Vertical Displacement
Excessively low vertical displacement looks like the runner is shuffling or gliding across the ground with each stride. It results in a smaller distance between the runners center of mass at their lowest and highest point (see image 4).
Image 4. Low Vertical Displacement
For a runner, the key is to find something in the middle that both provides the appropriate ground clearance and propulsion, but does not cause excessive displacement upward. I will discuss ways to effectively do this in future posts.
Both stride and vertical displacement are important aspects of a runners form to be aware of. Overstriding can increase a runners injury risk and decrease their running efficiency. Understiding can decrease a runner’s efficiency and speed. Excessively high vertical displacement can result in decreased running efficiency and increased stress on the body. Excessively low vertical displacement can result in decreased running efficiency and decreased speed.
Ultimately, every runner is unique and finding a running posture that feels best for your body and provides you with your optimal biomechanics will result in the best balance between improving your running efficiency and speed and decreasing your injury risk. As this series of running form tips continues, we will dive into ways runners can optimize their stride and vertical displacement for these purposes.
