A higher VO2 max means more oxygen is available to the muscles resulting in greater dynamic muscular endurance and overall physical fitness. It's no surprise that elite cross country skiers have higher VO2 max than other athletes. Cross country skiing engages just about all of the major muscle groups in the body. To emulate the physical exertion of cross country skiing at home or in the gym, consider the Concept2 Skierg, a versatile equipment that engages the arms, shoulders, core and legs in a downwards "crunch," using body weight to help accelerate the handles. To get an idea of how intense of a workout the Skierg can give you, watch the video. There are a variety of movements you can perform on the Skierg and it can also be used sitting down for athletes recovering from injury.