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What is causing hammy cramps??

 Raced HIM yesterday and had bad cramps in my hamstrings on the run. This is my 3rd HIM and all 3 have had the same cramping problems, despite increases in water intake and electrolytes (Endurolytes then most recently Salt Stick). Are there other causes of hamstring cramps other than de-hydration/nutrition?

I rode under my goal watts and ran slower than goal pace, which had been proven in Race Rehearsals. The problem is that the cramps started in Mile 7 and the RR only requires 6 miles. Any advice appreciated.

John

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