Walking Straight At Sea
As a child I went on a sea ferry and was amazed at how difficult it was to walk in a straight line. I had been reading a martial arts book that said that in the early days they walked on the outer edges of their feet to toughen them up for kicking. In addition, knees are bent slightly. In my experiments to walk in a straight line on the ship I thought this would be a good place to start, and got it in one. "Sea Dogs" were really impressed that I was walking in a straight line as they had not seen anyone do it in a lifetime at sea. A health warning must be given, doing too much too soon makes the feet ache, so start small and do more each day.
And using ships is better for the environment than using aircraft to travel. As used by Sea Shepherd Conservation Society.