ha! I love your friends support for her theory! I didn't personally have success swimming because the thing is, it was so boring to me. I even bought a iPod sleeve for swimming, and that really helped. It was like h20 audio or something, but I could not swim for 1 hour. I can however, run for an hour or even longer. I think if swimming is your thing, then more power to you. Swimming also is shown to make you hungry, especially if the water is not "warm"... here is an excerpt:
A closer look at the research reveals why...
The typical temperature range for a swimming pool is between 25.5 and 27.8 degrees Celsius.
In the first study, subjects swam in an outdoor pool where the water temperature varied between 23 and 25.5 degrees Celsius. That's pretty cold. But in the University of Utah study, the temperature of the water was 27 degrees Celsius — much closer to the temperature of most heated swimming pools.
Why does this matter?
Swimming in cold water stimulates your appetite so that you want to eat more. Many people feel extremely hungry after they've been swimming, especially if the water is cold.
As a result they simply replace all the calories they've burned with a large post-exercise meal, completely wiping out any potential weight loss benefits of the swimming.
"Many people observe that they feel like 'eating a horse' after they have finished a swim training session, and may overcompensate for the energy they have just burned," says Professor Burke.
Some evidence for this comes from a University of Florida study, where researchers examined the effect of water temperature on calorie intake after exercise [3]......
If you want to see the rest of the article, just highlight the first line and google it, it should link you there.
Overall, swimming takes a lot of preparation. Getting goggles, getting to a pool, etc. Running/ walking, you just throw on shoes and hit the pavement. That is the top exercise for me, and has worked thus far!!
-Mellon