25-year-old Valerio Grond from Graubünden is one of the great hopes of the Swiss cross-country skiing team. The U23 World Champion in sprint and a member of the silver relay team last winter in Trondheim has his sights set on the Olympic Games this season.
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After an intense running session or competition, you’re not just left with tired legs; your immune system also takes a hit. This is where the so-called «Open Window» effect comes into play.
