
Originally Posted by
Hushigoshi
As someone who also snowboards and has been personal training for about five years; for core stuff I would suggest paloff presses, and cable rotations/wood chops.
Palof press, and it's many variants (kneeling, standing, half kneeling, single leg) is all about stabilization through isometric contractions of the obliques, glutes, and lower back. Wood chops add the eccentric and cocentric phases to those areas.
Also throw in lateral lunges, and cross behind lunges to add more lateral stability and strength o your knees and quads; important to have nice controlled deep cuts when you carve.