In Old Norse, the word Víkingr means a person, while the word Víking means an activity. According to the sagas, the phrase "to go a-Viking" was used to describe the people from the north who went on voyages of discovery.
Here is a short video of Academy senior instructor Tyr Neilsen who went ‘a viking’, and traveled 15,000 km to 9 countries and several islands, to discover how it was to live and train as a Viking for a whole year.