Balance must be developed above all other skills, for great skiing to be possible. In dynamic skiing however, we talk about stability with mobility, as the notions of stability and balance must accompany mobility, anticipation and tactics to create great skiing.
Here are some snippets from that article:
The brain gets better and better at sending a motor program for a specific movement, each time the body performs the movement. If the proper motor program (ie- the proper movement) has been practiced you’ll get better at that movement skill.
So what if the motor program (and movement) is wrong--- Like that consistent slice you have in golf? Then your brain gets better at sending the wrong motor program. This is seen all the time in athletics. It's why coaches work so hard at getting their athletes to practice proper form.
Read We ski with the feet and ankles for more on how this applies to skiing.
There are many sensors in the soles of the feet, which we use to feel balance and, if the feet are cold, these sensors don't function as effectively. Also, the muscles' response times are reduced, when we need to react to balance changes.
If the boots are too wide or too big, then certainly the feet are sloshing inside without a good feel of whatever is outside the boot. Also, any small corrections we'd take to restore balance will not be effective, because they would not be transmitted through the boot.
On the other hand, if the boot is cramped up, that will also impair feeling for balance. Also, the range of motion available for balance correction is reduced. This is one of the reasons why properly fitted boots are paramount for good skiing and good footbeds, that don't take too much room inside the boot and which support the foot just enough but not more than needed and
If your workouts consistently include unstable surfaces such as wobble boards, balance mats, balance stones, exercise balls, bosu balls, skate boards, slide boards, etc… you will become a better balancer.
These kinesthetic skills will cross over into the sporting environment, allowing your body to adapt and adjust to the movements you demand with greater efficiency
Balance is created by sensing when we get out of balance and then reacting to restore balance, with dynamic movement. Range of movement, strength and agility for recoveries are critical skills: keep in shape! Core strength is especially important, as we have to move the upper body by leveraging the feet.
Balance is facilitated by proper movements (i.e. tipping and carving to have a platform to balance on) and is impaired by improper movements (i.e. upper body rotations) or strong twisting of the feet, banking into turns etc.
Training balance off the snow is a must! There are many related sports that develop balance and it can be part of a workout program by including balance boards, Bosu balls and other.
Balance must be developed on snow as well, to learn and engrain proprioceptive reactions to typical skiing situations, as challenging and increasing ranges of movement.