Young athletes in the Learn to Train stage should be participating in a few other sports in addition to orienteering based on their interests. This could be skiing, cross-country and track and field, mountain biking, soccer, hockey, curling, etc. A wide variety of sports at this stage is still very benificial in teaching a wide skill set and reducing injuries from overuse and repetitive strain. The benefit seen from spending more time learning sport specific skills in a single sport is not nearly as valuable learning a wide base of athletic skills at this stage upon which to build sport specific skills in later development.
No relevant resources have been linked to the skill or practice "Participating in 2-3 sports in addition to orienteering".