Generally,to get aerobic conditioning from swimming,you need to:

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Keeping up a pace that makes you feel pleasantly tired, but not exhausted, is the best way to get aerobic conditioning from swimming. This means maintaining a consistent intensity throughout your swim that raises your heart rate and breathing without completely wearing you out. The sidestroke is not necessarily better for aerobic conditioning than other strokes, and monitoring your heart rate in the water can be difficult and inaccurate. Churning the water for 5 minutes before resting is not a recommended way to improve aerobic fitness.

Generally,to Get Aerobic Conditioning from Swimming,you Need To