That's a bit risky, eh?
His father was a professional skiier and his mother was a ski instructor who used to give lessons on that very mountain. He said he learned to ski before he even started playing tennis. He says he often gets that from insurance companies, what you're saying but he said skiing is his second biggest passion so he never accepts any contracts with that clause in them. Besides, he's not stupid, I'm sure he's not going on any huge daredevil slopes. He probably just likes the feel of going skiing and given that he learnt it properly at such a young age from qualified people, I'm sure he's plenty equipped to do it pretty safely on a regular mountain, bar a bit of a freak accident and they can happen anywhere.