Concept2 SkiErgConcept2 SkiErg The SkiErg helps build strength and endurance using the poling motions integral to the sport of Nordic skiing, but you dont need to be a skier to benefit from the terrific low impact and full body exercise. The double poling movement involves not just arms and shoulders, but also core and legs; classic ski technique (alternating arms) is also possible. The SkiErg easily accommodates adaptive athletes and those with lower body injuries,