Some swimmers, particularly those that are narrow chested or lank and lean, can never learn to float, though once you know how, it is easier and far more comfortable than "falling off a log."
At first, when learning to float on your back, and by the way that is the only way to do it properly, you will find yourself sinking slowly, feet foremost, until you seem to be standing up, and must use some exercise to keep afloat; but you can learn.
Before lying flat on your back, inflate your lungs fully; as you do so you will be surprised to see how you seem to lift out of the water. Now, before your lungs are exhausted, for you will sink as they empty, breathe deeply again and exhaust slowly as before, keeping your arms by your sides and your legs close together and extended.
Don't expect to float like a life boat at the first try, for you are not built along life boat lines; but if you stick at it, and make the experiment at least once every time you go in swimming, you will float well before the summer is over.
GOING IN
If you know the water, the best way to enter it is by a quick plunge or a straight dive.
To walk into the water and "duck" is rather an ignominious proceeding, only to be excused in the novice or the lady bather we see at our watering-places bobbing up and down at the end of a rope. The swimmer should not rest content until he is able to plunge in like a workman; but first, a word of caution! Never attempt to dive unless you know that the water is deep enough for the purpose.
Many serious accidents have occurred from this mistake, notably when bathing at sea. An incautious plunge from the ship's side into the sail bath extemporized overboard to ward off any danger from sharks has resulted fatally to the rash swimmer, and at all times danger attends rash plunging.
It is, nevertheless, astonishing into what shallow water an expert can fearlessly dive from a height, his arms and head emerging almost before the feet have disappeared beneath the surface. The diver needs to be very quick of hand and eye, and many accidents attest the fact of the game not being worth the candle.
I have seen bathers extend the arms over their heads and fall forward, which generally entails a smart tingling of the chest and stomach, as the body is almost certain to drop flat on the surface.