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Despite its name, the Natural Energy Lab segment of the Ironman World Championship in Kona, Hawaii does little to provide strength to athletes. The stretch, which comes towards the end of the marathon, is often where the biggest passes are made and where many athletes, including professionals, resort to the dreaded Ironman shuffle.
Here are photos of the professionals making their way through this treacherous stretch of the run.
Complete coverage of the 2010 Ford Ironman World Championship.