4x4000: a simple name for an ambitious project: 4 days, 4 mountains above 4000 metres. This is the name of the enchainment of the highest mountains of the Aosta Valley born from an idea of Davide Cheraz, professional trail runner. Starting from Courmayeur, with his friend and Alpine Guide Pietro Picco, the two cycled to the feet of the Matterhorn, then climbed up the Lion’s Ridge to reach the summit. After this the other mountains in a succession: Margherita Hut on MonteRosa, Gran Paradiso and finally Mont Blanc, in a succession of cycling and climbing.