"This was one amazing day of trail running above Chamonix in the French Alps with stupendous views of Mont Blanc in the background and a real toothy-white mountain horizon all the way around" says Claire Maxted. "We ran on stoney, grassy and muddy paths to Lac du Brevent which was a picture-perfect pool of aquamarine nestled in the mountainside. Absolutely glorious. I wished I had more time to stop and stare at it. I'll be back Chamonix!"