The best thing one can do preseason is to establish a stretching program. If you are of the undisciplined lot then enroll in a yoga or stretching class to loosen up. This will help motivate and guide you toward proper technique. For the self-motivated, concentrate on hip flexibility, hamstrings, and trunk limbering. For timing and a good plyometric workout, try jumping rope.
Bongo bards are fun and are used by many national ski teams for coordination drills.
Excellent cross training can be done through inline skating, tumbling classes, trail running, rock climbing and trampoline training. Strength training helps athleticism as well as helps prevent injury. Flexibility refers to the range of motion at a joint or joints and strength will help control those movements. Most avid skiers like to work on their quad muscles and forget about the opposing hamstring muscles. Work the opposing muscles and spend extra time on the trunk this season.