Checkpoint food can be found under Checkpoint Food and Drinks.
Important recent research on the causes of cramping indicate that salt supplementation is not necessarily a cure (and can contribute to overhydration - hyponatremia).
This summary from Muscle Cramping During a 161-km Ultramarathon: Comparison of Characteristics of Those With and Without Cramping
by Martin D Hoffman and Kristin J Stuempfle
Conclusion: From this work, we conclude that muscle cramping and near cramping are common in a 161-km ultramarathon, largely involve the most active muscles, and tend to occur after the early segment of the race. Compared with those not having cramping, those with cramping or near cramping are more likely to have a prior history of muscle cramping during an ultramarathon, and evidence suggests that they are placing greater demands on their muscles during the race relative to their current state of training. Hydration status, intake rate of sodium in supplements, and serum sodium concentration do not differ between those with and without cramping. Of the two main theories for the pathophysiology of exercise-associated muscle cramping, the present findings support a muscle fatigue basis for muscle cramping during ultra-endurance exercise over the theory based on hyperexcitability of motor neuron axon terminals due to an electrolyte or fluid imbalance.
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