I believe the arm recovery may be the most important part of the swim stroke in front crawl. It is to me similar to a 12 volt power inverter converting power to 110 volts. The action above the water is what produces the power of the stroke underwater.
In 1958 I started writing a book titled Power Swimming from the Start I did not complete this book and it is still unfinished and probably will never be finished. It was one of the concepts I had written about.
