So what does all this mean to you as a recreational swimmer?
The bottom line is that swimming is a great form of exercise, and makes an excellent part of anyone's workout program. But if you are swimming regularly and wondering why you're not losing weight, it may be time to get out of the pool and hit the streets - minute for minute, running is the most effective form of cardio training for burning excess calories.
This does not mean that you should not swim. But if you are trying to lose weight, be sure you are doing other forms of exercise, particularly those that are proven to burn off the fat - running, interval training and weight training for example.