From Health Fitness Revolution, here are the top health benefits of Skiing; 

Improves Proprioception- proprioception is one's ability to feel the position of different body parts and the effort needed to move them. 

Strengthens bones and joints-knees endure tension and weight from your body as you turn quickly. There's also a lot of weight bearing impact. 

Boosts your mood-Skiing boosts happiness and well-being

Increases cardiovascular endurance: Skiing can help with burning calories and weight loss. You can also burn calories by walking up slope instead of taking the ski lift. 

Strengthens lower body muscles-Skiing puts you in a constant squat position. It works your inner and outer thighs, hamstrings, quads, and glutes. 

Improves balance and core strength- With skiing, your core is always engaged. 

Promotes deep sleep- It's a gaurantee that you will be exhausted after a day of skiing, but in a good way that promotes deep, restful sleep. 

Improves flexibility- Flexibility helps avoid muscle strains and sprains. 

Promotes healthy eating habits-To face a day of skiing, you have to power up with good, nutritous food: lots of protein, healthy fats, less sugar, and more fruits and vegetables.