To do a squat jump, assume a squatting position where your thighs are parallel to the floor. Explode out and up jumping as high as you can. Swing your arms with the jump to increase momentum. Land, descend into the squatting position again, and repeat several times. This forceful, rapid jumping builds power in many of the major muscle groups used in skiing.
Anaerobic fitness is developed to a degree with power training.
You can further enhance your body's ability to utilize chemical energy and recover quickly by doing activities for short periods of time, usually less than three minutes, at a near maximum level of exertion. These can be the sprints, cycle intervals, and uphill walking activities we talked about above. After each interval or sprint, rest for about twice as long as your exercise interval, and repeat. The rest should be active, such as a jog or easy spin on the bike. Balance activities to train your body's kinesthetic sense can be as simple as standing on one leg for as long as you can to walking on balance beams, rock climbing, boulder hopping, and more.