Swimming is a great form of exercise that does not put pressure on the joints and that does not strain the back. However, there are a few things to consider, depending on the type of swim, to ensure that you do not cause any pain to yourself later.
Chest swimming is a nice, non-tire way to move in the water. But to make sure that the neck muscles are not strained, the head should be submerged in water rather than kept on the surface all the time, according to the German Action Back Pack initiative.
Swimming is the fastest swimming technique and requires a lot of arms work. To make sure not to squeeze them, you should not only wrap your head but the entire body next to yourself when taking a breath.
For back swimming which is considered the most healthy swimming technique in general, it is important that the person does not extend his head excessively back.