The Mighty Force of Nature
Who says swimming can only happen underwater? It's possible to swim on the surface too, just like this person. If you're thinking that the man is being propelled out of the water by an unseen magnetic force, you're correct!
However, in reality, the invisible force is simply a flat rock beneath him. Take a look at him enjoying himself to the fullest. Would anyone be interested in organizing a beginner's course on plank swimming?
