Why do we never see astronauts and others swimming in air in free fall?
The swimming strokes that work well under water on earth are the breast stroke and especially that "Man from Atlantis" stroke that has recently somewhat revolutionized competitive swimming. I'd like to see astronauts on the ISS or failing that, people in free fall in an airplane flying in a parabolic path swimming in air like that.
It might be an idea to get a champion swimmer like Mark Phelps to try swimming in air in a parabolic path airplane. Or the guy in this video:
A way to correct for the effect of air currents and unplanned movements of the airplane or space station during a demonstration that swimming in air either works or doesn't would be to have pairs of air swimmers swim in opposite directions.
Swimming in air might be a good form of exercise and relaxation. Astronauts could have races or set records.
If it's impossible to make any headway, why don't we ever see that fact demonstrated?