http://ffden-2.phys.uaf.edu/211.fall2000.web.projects/Tina%20Osness/Physics%20Project%20Resistance.html
http://www.faqs.org/sports-science/Sp-Tw/Swimming-Resistance.html
http://www.wired.com/2012/07/olympics-physics-swimming-starting-blocks/
https://sites.google.com/site/poiswimming/archimedes-principle
https://sites.google.com/site/poiswimming/buoyancy
https://sites.google.com/site/poiswimming/newton-s-laws-of-motion
https://sites.google.com/site/poiswimming/propulsion