Glossary: Running Effectiveness (RE)

Running Effectiveness (RE) is a metric introduced by Dr. Andrew Coggan calculated as the ratio of speed to power. The greater its value, the more 'effective' the runner is at converting external power into speed. Novice or fatigue runners may have lower values since they do not travel as fast for a given power output or must generate more power to achieve the same speed.

RE [kg/N] = Speed [m/s] / Power [W/kg]

Rating (only valid for Stryd)

On flat terrain with good running conditions.

Category	Stryd (non-wind device)	Stryd (wind device)
below average	≤ 0.95	≤ 0.91
average	0.96 - 0.98	0.92 - 0.94
above average	0.99 - 1.01	0.95 - 0.97
likely the realm of elite world class runners	≥ 1.02	≥ 0.98

See also

• Efficiency Index

References

1. Palladino, S.: Understanding Running Effectiveness and Its Uses
2. Running with Power Revisited - Advanced Analysis with Steve Palladino | EP#93

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