Video – Butterfly Evolution – 1970s-21st Century (Mark Spitz vs. Michael Phelps)

http://blog.swimator.com/2011/05/ultimate-match-up-michael-phelps-vs.html Butterfly evolution from 1970s to 21st century. See how Mark Spitz’s butterfly stroke compares to Michael Phelps is fly phenomenon. This video examines Spitz’s and Phelps’ strokes side by side for a better contrast […]