What is vertical oscillation in running?
How far your centre of mass moves up and down with each stride. Excess vertical movement is energy spent going up rather than forward.
Vertical oscillation measures the up-and-down displacement of your centre of mass through the stride cycle, typically 6–13 cm depending on speed and individual mechanics. Some is unavoidable and even necessary — the flight phase is what makes running running — but movement beyond what is needed to clear the swing leg is wasted work.
The more informative version of the metric is vertical ratio: oscillation divided by stride length. A runner with 9 cm of oscillation and a long stride is doing better than one with 9 cm and a short one, because the same vertical cost is buying more horizontal distance. Watches that report both are giving you the more useful number in the ratio.
It correlates with economy, but the causal direction is not simple. Attempting to consciously suppress vertical movement usually degrades economy rather than improving it, because you are overriding a coordinated pattern to optimise one component of it. Where oscillation improves, it is generally a side effect of better strength and rhythm rather than a direct target.
Treat it as one input among several. Alongside ground contact time and cadence it helps build a picture of how you run, which is what the economy model on this site uses it for — not as a score to minimise.
Key numbers
| Typical range | 6–13 cm | varies with speed |
|---|---|---|
| Better metric | vertical ratio | oscillation ÷ stride length |
Work it out for yourself
Running economy calculator — Feed your own oscillation and contact-time data into the economy model.
Frequently asked questions
Is lower vertical oscillation always better?
No. Some vertical movement is mechanically necessary, and deliberately minimising it typically makes economy worse. What matters is vertical movement relative to the distance each stride covers, which is what vertical ratio captures.
How do I reduce vertical oscillation?
Indirectly, if at all. Strength work, higher cadence where overstriding is present, and simply accumulating training volume all tend to reduce it as a by-product. Consciously trying to run flatter usually adds cost rather than removing it.
Sources
- Moore (2016). Is there an economical running technique? A review of modifiable biomechanical factors. Sports Medicine.
- Barnes & Kilding (2015). Running economy: measurement, norms, and determining factors. Sports Medicine - Open.
Related explainers
Glossary: Running Economy (RE)