Ground Contact Time (GCT)—the exact amount of time your foot remains in contact with the ground during each stride—is one of the most critical metrics in running biomechanics. Measured in milliseconds (ms), GCT serves as a direct indicator of your running efficiency, elastic energy return, and overall speed.
Understanding how GCT impacts performance—and how to optimise it—can help transform your stride and lower your risk of injury.
What Is Ground Contact Time?
Every running stride consists of two main phases: flight phase (when neither foot touches the ground) and stance phase (when one foot is on the ground). Ground contact time measures the duration of the stance phase.
- Recreational Runners: Typically exhibit a GCT between 250 ms and 300+ ms.
- Competitive Runners: Generally range between 200 ms and 240 ms.
- Elite Sprinters / Distance Runners: Can drop GCT down to 160 ms – 200 ms at high speeds.
[ Touchdown ] ---> [ Mid-stance / Cushioning ] ---> [ Toe-off ]
|<---------------- Ground Contact Time (GCT) ---------------->|
Why Ground Contact Time Matters
Energy Loss vs. Elastic Recoil
When your foot strikes the ground, your muscles and tendons act like springs. A shorter GCT allows your body to take advantage of the stretch-shortening cycle (SSC), storing kinetic energy upon landing and releasing it explosively at toe-off.
If your foot stays on the ground too long, that potential energy dissipates as heat, requiring your muscles to expend significantly more metabolic energy to push off for the next stride.
Overstriding and Braking Forces
Excessive GCT is often a symptom of overstriding—landing with your foot extended far ahead of your centre of mass. This creates a "braking force" that slows your forward momentum and increases shock load on the knees and hips.
Ground Contact Time Balance (GCT Balance)
Advanced running watches also track GCT Balance, which measures the symmetry between your left and right foot contact time (e.g., 50.0% Left / 50.0% Right). Significant asymmetry (e.g., 48.5% L / 51.5% R) often signals muscle imbalances, fatigue, or an impending injury.
Key Differences Across Speeds
| Metric | Jogging / Recovery Pace | Marathon Pace | 5K / Tempo Pace |
| Average GCT | 260 ms – 300+ ms | 220 ms – 250 ms | 190 ms – 220 ms |
| Primary Driver | High vertical oscillation, lower cadence | Balanced elastic bounce & cadence | Rapid leg turnover, powerful push-off |
4 Ways to Reduce Your Ground Contact Time
Increase Your Cadence: Aiming for a slightly higher stride rate (steps per minute) naturally reduces the amount of time each foot spends on the ground.
Land Beneath Your Centre of Mass: Focus on pulling your feet back under your hips rather than reaching forward with your heel.
Incorporate Plyometrics: Exercises like pogo hops, box jumps, and bounding train your tendons to store and release elastic energy faster.
Strengthen the Lower Posterior Chain: Heavy calf raises, hamstrings curls, and single-leg stability work build the stiffness required for quick toe-offs.