Nordic skiing develops both strength and endurance as well as exercising the legs, arms, and core. ... An indoor skiing machine is a form of aerobic fitness equipment that resembles the range of motion that nordic skiing on snow produces. This machine is most commonly used for skiing training and aerobic exercise training. Skiing machines come equipped with ergometers which are devices that measure the amount of work performed or force produced by the athlete. Indoor skiing machines also measure the amount of energy or calories the athlete expends while exercising with this equipment. Indoor skiing machines are suitable for both home gym and commercial gym use.