Ever wondered exactly what your arms and legs were doing during each of the four primary competitive swimming strokes: backstroke, breaststroke, butterfly, and freestyle?
We came across this video today on Facebook, and found the original source (as best as we can tell) on a YouTube channel called “anybodytech” from 2008.
The video looks at a muscular and skeletal level at what is happening during each of the four major strokes. When a muscle turns purple, that means it is activated.
The research for these videos was done by a doctor Nakamisha at the Tokyo Institute of Technology. In the video’s info, there is a link to see more information on each video.
If you were ever wondering why, exactly, butterfly is so exhausting, this video gives a good indication – the arm muscles are constantly activated. Unlike the other strokes, there’s never any significant period of relaxation.