LA SFIDA - the challenge offers the unique opportunity for amateur athletes to experience a multi-stage cross-country race. With the Tour de Ski as a model, the final day comes up with the real challenge, an unforgettable ascent to the finish. Single start, mass start, bonus seconds, everything that is established in the professional circus is also offered here. The stages take place in a different location every day, which offers the opportunity to get to know the wonderful cross-country ski trails in the Upper Engadin. We face the unique challenge.