No case of exercise-associated hyponatremia in male ultra-endurance mountain bikers in the ‘swiss bike masters’. The load-associated hyponatremia is observed relatively often in endurance athletes. Today’s opinion is that rather slow athletes drink relatively too much and thereby comes to a dilution. On the ‘Swiss Bike Masters’ we found surprisingly that the fastest drivers drank the most and that still no mountain biker developed a hyponatremia. The results of the study can be found under https://pubmed.ncbi.nlm.nih.gov/22229504/