fundamentals
Choosing the Right Exercise
Cross country skiing
Cross-country skiing exercises the upper body and the legs. Many people enjoy using machines that simulate cross-country skiing, but others find the motions difficult to master and stressful around the hip joints and inner thighs (although working with shorter leg strokes often helps). Because using these machines requires more coordination than most types of exercise, a person should try out a machine before buying one. Cross-country skiing outdoors is more enjoyable to some people but adds the challenges of exercising in the cold while maintaining balance. 