What is the most common way to swim?

Answer 1

I depends on the context but the default swim for most people is definitely the freestyle. It is the first form a swimming taught to children. It was originally called the front crawl but after it's dominance in freestyle swim competitions (competitions where any stroke could be used) it eventually became known as freestyle swimming. It became popular in the middle of the 19th century and before that the breast stroke was the most used stroke.