Last sunday, we went to run Sierre-Zinal as a training for the 51 k version of the Eiger Ultra Trail in 2 weeks. We were the 3 Tarahumara Spirit members, Kristof, Renier and myself. Super nice weather, nice hike, always brutal both uphill and downhill. We also tested some new re-fueling options based on peanuts, dried dates, dried apricots and dried figs or a mixture from the Coop called Studenttenfutter !!! Result was a mild metabolic crisis for the 3 of us but at different times and various symptoms (nausea, weak legs, etc). To be tested more scientifically. 31 k, 2100 m ascend, 5h20 moving time, 6h40 total. No muscle soreness the next days. Just hungry... That is the Tarahumara Spirit.