Ground contact time (GCT) is a running metric that measures how long your foot stays on the ground during each stride, specifically, the stance phase, when you’re weight-bearing, absorbing impact, and pushing off into the next step.
It sounds like a tiny detail, but it can tell you a lot about how you run. GCT is closely tied to cadence, stride mechanics, and stiffness/elastic return through the ankles and calves, all of which influence running efficiency.
It can also help explain why some runners fade late in workouts: as fatigue sets in, many runners start “sitting” into the stride, their contact time increases, and the pace feels harder at the same speed.
That said, it’s easy to misread. Lower GCT isn’t automatically better, and the real value is learning what your baseline looks like and spotting trends: when it improves, when it spikes, and what changes might be driving it.
Understanding what your ground contact time means, and what it doesn’t, can help you run smoother and more efficiently, and potentially reduce injury risk by cleaning up mechanics that create unnecessary braking and impact.
Let’s break down what to look for, why runners often misinterpret this metric, and a few practical ways to improve it.
What Is Ground Contact Time?
A runner’s ground contact time, or GCT for short, refers to the length of time that your foot is in contact with the ground during your running stride.
From the point at which your foot first makes contact with the ground1Hamill, J., & Gruber, A. H. (2017). Is changing footstrike pattern beneficial to runners? Journal of Sport and Health Science, 6(2), 146–153. https://doi.org/10.1016/j.jshs.2017.02.004, which is called either initial contact or ground contact when referring to the running gait cycle, until the same foot is up into the air after push-off constitutes the foot’s total ground contact time.
If you land on your heel or rear foot, the stance phase involves a complete rollover of the foot. Your weight travels from your heel towards your toe for a push-off, a process known as the heel-to-toe transition.
How do you calculate It?
Ground-contact time is measured in milliseconds (ms).
There are 1000 milliseconds in one second, so a GCT running of 500 milliseconds means that your foot is in contact with the ground for half a second from the time you land on your foot at initial contact (or heel strike) until you push off at toe-off.
What Is Ground Contact Time Balance?
Ground contact time balance further differentiates your ground contact time by comparing the times between your right and left feet.
Essentially, a runner’s GCT balance measures the symmetry between the right and left sides of the body when the foot is in contact with the ground.
Running is a unilateral but reciprocal motion, which means that the right and left sides of the body perform the exact same movement pattern but in opposition to one another.
GCT balance is so important for runners because symmetry in the running stride improves efficiency and economy and reduces the risk of injury.
Any deviations in the movement arc or metrics, such as GCT in the right foot vs. the left, increase the risk of injury and compromised performance.2Joubert, D. P., Guerra, N. A., Jones, E. J., Knowles, E. G., & Piper, A. D. (2020). Ground Contact Time Imbalances Strongly Related to Impaired Running Economy. International Journal of Exercise Science, 13(4), 427–437. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7241633/
This is because if you do not display balance, one side of your body will be doing more work or contending with higher forces for a longer time than the other side.
What is a good ground contact time balance?
Ultimately, a 50/50 ground contact time balance is ideal, though a 51/49 GCT balance is also okay. Anything more than a 2% differential between your right and left foot indicates poor GCT balance.
What Is A Good Ground Contact Time Value?
As with most stride-dynamics metrics—like cadence and stride length—there’s no single “best” ground contact time that applies to every runner.
In general, shorter ground contact times tend to correlate with faster running, because you’re spending less time on the ground and more time moving forward. But the story isn’t that simple.
GCT balance (how evenly you load your right vs. left side) can matter just as much, sometimes more, than the overall average.
Take two recreational runners who both run five miles wearing watches that track GCT:
- Runner A: average GCT = 300 ms
- Runner B: average GCT = 250 ms
At first glance, Runner B looks “better.” After all, if your foot is on the ground for less time, you might be running more efficiently and generating quicker turnover.
But the average GCT is a blended number across both feet for the entire run. If you dig deeper and compare right vs. left, the conclusion could flip.
Let’s say Runner A has excellent GCT balance and both feet land around 300 ms throughout the run.
Now imagine Runner B has poor balance: one foot might hit 230 ms, while the other lingers at 270 ms (or more). That kind of left-right asymmetry can indicate a compensation pattern or subtle stride issue, even if it’s not obvious to the naked eye, and it can come with efficiency costs and, potentially, a higher injury risk over time.
If the runner were to undergo a video gait analysis that slows down the running form frame by frame, we would be able to see that the right foot might spend significantly more time on the ground than the left foot during each complete gait cycle.
So even if Runner B’s overall average GCT is 250 ms, the right and left sides could be doing very different things.
To simplify the math, imagine the right foot is at 350 ms, and the left foot is at 150 ms. The average still comes out to 250 ms, but the balance is off, with a 200 ms gap between sides.
In that scenario, Runner A’s “slower” 300 ms average may actually be the healthier, more efficient pattern because it’s symmetrical and consistent, while Runner B’s faster average could be hiding a compensation or asymmetry that costs efficiency (and may increase injury risk over time).
As for what numbers are typical: while we don’t have a perfect universal benchmark (and studies vary), many recreational runners fall roughly in the 200–300 ms range. Elite distance runners are often faster—frequently under 200 ms, especially at higher speeds.
Sprinters may have the best GCT running because the entire race performance hinges upon maximizing forward velocity.
Why Should I Try To Reduce My Ground Contact Time?
Reducing your ground contact time (GCT) can benefit you in several ways, especially if you aim to improve your running performance and efficiency.
Here’s why:
#1: Improved Running Efficiency
Shortening your GCT means spending less time with each foot on the ground during a stride. This can lead to smoother running dynamics and a more efficient use of energy, ultimately improving your overall running efficiency.
With less time spent on the ground, you can maintain a faster pace with less effort, potentially leading to better race times, especially in endurance events.
#2: Decreased Metabolic Cost
A shorter GCT is associated with lower metabolic costs during running.3CHAPMAN, R. F., LAYMON, A. S., WILHITE, D. P., MCKENZIE, J. M., TANNER, D. A., & STAGER, J. M. (2012). Ground Contact Time as an Indicator of Metabolic Cost in Elite Distance Runners. Medicine & Science in Sports & Exercise, 44(5), 917–925. https://doi.org/10.1249/mss.0b013e3182400520
By spending less time on the ground, your muscles need to work less to propel you forward, resulting in reduced energy expenditure and lower heart rates for the same running speed.
This can translate into improved endurance and the ability to sustain higher speeds over longer distances.
#3: Reduced Risk Of Injury
Optimal GCT is often linked to better running techniques and biomechanics.4Adams, D., Pozzi, F., Willy, R. W., Carrol, A., & Zeni, J. (2018). ALTERING CADENCE OR VERTICAL OSCILLATION DURING RUNNING: EFFECTS ON RUNNING RELATED INJURY FACTORS. International Journal of Sports Physical Therapy, 13(4), 633–642. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6088121/
By focusing on reducing overstriding by increasing cadence and improving foot strike patterns, such as landing on the forefoot rather than the heel, you can minimize ground reaction forces and leg stiffness, which are common contributors to running-related injuries.
Incorporating drills and using tools like foot pods or devices to monitor GCT can help you fine-tune your running technique and mitigate the risk of overuse injuries.5Heiderscheit, B. C., Chumanov, E. S., Michalski, M. P., Wille, C. M., & Ryan, M. B. (2011). Effects of step rate manipulation on joint mechanics during running. Medicine and Science in Sports and Exercise, 43(2), 296–302. https://doi.org/10.1249/MSS.0b013e3181ebedf4
4 Ways to Improve Your GCT
#1: Use A Wearable Device
A recent study6Giraldo-Pedroza, A., Lee, W. C.-C., Lam, W.-K., Coman, R., & Alici, G. (2020). Effects of Wearable Devices with Biofeedback on Biomechanical Performance of Running—A Systematic Review. Sensors, 20(22), 6637. https://doi.org/10.3390/s20226637,found that even using a running watch or wearable device that provides biofeedback on running biomechanics can help decrease GCT in runners.
The results showed that when runners received immediate feedback from the wearable device, they could reduce vertical oscillation (bouncing or up-and-down movement) and other biomechanical factors of the running stride.
Some of the best GPS running watches with high-tech capabilities can now provide not only basic GCT running averages but also your GCT balance while running.
Getting real-time feedback may help raise awareness of the symmetry in your running stride and your “quickness” on your feet, which can improve GCT balance and average ground contact time, respectively.
#2: Incorporate Running Drills Into Your Warm Up
Incorporating running drills into your warm-up is one of the easiest ways to improve ground contact time because drills reinforce quick, elastic foot strikes and efficient force application.
Exercises like high knees, A-skips, B-skips, butt kicks, and straight-leg bounds train your nervous system to apply force rapidly and spend less time “sitting” on the ground with each step.
Over time, these drills help you develop better coordination, increased ankle and calf stiffness, and a more responsive stride—qualities that naturally reduce excessive ground contact without forcing changes mid-run.
#3: Get Stronger (Especially Calves, Quads, and Glutes)
Stronger muscles apply force to the ground faster. Heavy calf raises, squats, split squats, and step-ups improve your ability to absorb and reapply force efficiently, which naturally shortens contact time.
#4: Increase Your Cadence
Lastly, using a metronome app or deliberately increasing your running cadence can help reduce your running ground contact time.
A higher cadence will often include shorter stride lengths, reducing overstriding, facilitating faster transitions between foot strikes and push-offs, and improving overall running economy.
By taking shorter strides and maintaining a higher cadence, runners can spend less time per stride with each foot on the ground.
For more information on your running cadence, check out our guide here:
Amber, Solid article on a important topic. Curious what your thoughts are on balance training in different planes statically on a Slack Line and or single leg stances on balance objects in decreasing GCT and improving symmetry? It seems to me that that is key and overlooked in this post and many others on this topic. Thank you!
Hi AMBER 🙂
I run for more than 10 years and I also did a full Marathon and uncounted races down than that. 2 months ago I decided to use Garmin coach to get a specific result that I want to gain. so I started to look at the categories such as GCT or cadence and your articles gave me a lot of INFO that I never had before! now I now how i start to be better runner.
thanks a lot!