Julien took my 10 years old son and I for a 3 hours mountain biking loop in the valley of Chamonix. After we got all the gears at Legend CHX, he showed us our loop on a map and told us about the difficulties we may encounter. Although there is a lot of snow remaining, Julien was able to choose the right trails. If it was too steep or too difficult to climb up or down, Julien gave us a hand carrying our bikes. Last but not least, he gave us a little show with his impressive mountain bike skills. My son was delighted and I highly recommend him.