Probably freestyle or backstroke, they have the easiest techniques and it is easier to coordinate with. Breastroke and butterfly would be harder since u have to focus on the rhythm and coordination of the kick. :)
All string instruments can be difficult to learn, but the violin may be the easiest to learn.
You learn from your parents or a teacher.
They don't learn swimming, its instinctive.
to learn or have fun
According to About.com, the violin is the easiest to learn. The top 10 instruments that are easiest to learn seem to be mostly string and woodwind instruments. Article: http://musiced.about.com/od/beginnersguide/tp/tinst.htm .
The easiest Bach invention to learn on the piano is typically considered to be Invention No. 1 in C major.
With a teacher
Take swimming lessons or ask a life guide to learn
The easiest Chopin ballade for a beginner to learn is typically considered to be Ballade No. 1 in G minor, Op. 23.
Depends on how you learn, I find repetition easiest
it's definitely one of the easiest foreign languages there is to learn.
Eclipse is very easy and intuitive to learn with, and free!