I love to go snowboarding on the ski slopes in the winter
Snowboarding looks so fun, but difficult
Yes going down a hill where both feet are on the same board is harder than skiing for sure
I bet it requires a lot of balance to do
Yes I find it much harder than skiing.  I also like cross-country skiing across terrain as exercise
Skiing cross country seems like it requires less skill than snowboarding
Yes it is used as a method of transportation a lot of places, but it definitely takes more energy than going downhill
I bet it's a good workout!