How the hand and forearm are used to propel a swimmer through the water has been the subject of great debate and controversy since the advent of modern competitive swimming. We like to study the history of swimming and why the fastest swimmers swim the way they do. Then we can take that analysis and couple it with science to come to some conclusions on what might be the fastest way to swim. We break down each millisecond of the arm cycle to show what happens when we swim. We look at why everything we do is important, from the moment our hand enters the water, through it’s underwater phases and through the recovery. Gary Hall Sr. begins the Freestyle Underwater Pull series with this Introduction. It is a History of Analysis of the freestyle pull in the sport of Swimming. We will break down the underwater cycle into 4 phases and prepare you for our own analysis of the freestyle arm cycle.