That defined category is the one to understand. C.R.S. 33-44-103 lists the inherent dangers and risks of skiing, and the list is not short. It takes in weather that changes, snow in every state from powder to hard pack to slush to machine-made, bare spots, forest growth, rocks, stumps, streambeds, cliffs, extreme terrain and trees, variation in steepness whether natural or produced by slope design or grooming, and impact with lift towers, signs, posts, fences, hydrants, water pipes, and comparable structures. An injury sourced to that list is generally an injury the law leaves where it fell.
The same definition then draws its own boundary. Inherent dangers and risks of skiing expressly do not include the negligence of a ski area operator described at C.R.S. 33-44-104(2), and the section states that nothing in it limits an operator's liability for injury caused by the use or operation of ski lifts. Those two carve-outs are the reason ski cases exist at all.
Worth stating plainly, since paraphrases of this Act circulate freely and inaccurately: the statute is built on the term "ski area" and on sliding downhill or jumping on snow or ice. It draws no distinction between disciplines of skiing, and it imposes no helmet obligation on anyone, of any age.