A completely new concept of the relay and team participation, with the aim of being a challenge not only in running but also in teamwork skills. It is NOT a relay race of individuals, but a team where the four group members act as a unique mind. S1 Relay: 1 team, 4 paticipants. Two key rules: Mixed teams. The male approach to sport that meets the female view of life in a winning combination and synergy, where one compensates and complete the other. Or where they can ignite the most bitter clashes: Ipertrail is this. The meeting of two worlds, the competitive and aggressive male approach, marry with the rational planning of the female side. Each team must be mixed. Responsible for the team members. Everyone has his habits, his equipment, his preferences. Ipertrail transforms them into group needs: they all run with the same backpack, the same equipment and the relay changeover is passing the backpack. Train every run with the same backpack, even if with different heights, gender and weights. Be responsible for the completeness and integrity of the equipment of the partner: these are the keys of Ipertrail.