If you are not a specialist in a particular style of swimming, it is advisable to change your style for lengths. In this way, the resistance indirectly, since when changing swimming style, different muscles are applied and the whole body is prepared for the practice of swimming. swimming.
The division into series it also helps to improve endurance. To begin, it is preferable to do series of 200 meters with breaks of 2 minutes between each one.
Perform movements long. In this way, the maximum effort time to move the body in an aquatic environment is reduced.
Pay particular attention to the breathing it is the key to improving endurance in a sport like swimming. You have to try to take in a lot of air, and then expel it slowly and continuously into the water.
The last recommendation to improve endurance is to swim frequently, if possible every day. To avoid frustration, you should avoid setting yourself too great challenges, in any case it should be set objectives progressive.