Cross-country skiing

I had so much fun today! It was a beautiful sunny day, about -2 degrees. I went Cross-country skiing with my son and my Dad. I need to learn how to dress properly as I was soaked wet when I got back. I want to add this activity on my fitbit app (IOS) but it allows me to add only exercices that are already set in (ei walk, run, biking). I did a search but nothing is coming out in the database. Does any one knows how to do it?

It is calling for 2 days of freezing rain . Can't wait to get back on the trails!

Here is a picture of my son and my Dad.