Pedaling in a simple circle is a complex thing, but mastering it can save energy, says Todd Carver, biomechanist at Colorado's Boulder Center for Sports Medicine. He says that with proper ankling (shown here; not the injury-causing technique of the past), riders can churn out the same amount of power at a heart rate as many as five beats per minute lower. This stroke is for flat terrain at threshold, or time trial, intensity.
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