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actually, the body runs on energy, not carbs. carbs, in the form of blood glucose, are just the quickest supply (not counting the PC system because it isn't long term). the body fuctions pretty well on ketone bodies too... the brain and most other non-muscle organs can live on ketones alone, although it's less efficiant than glucose (one reason why i don't think it's a good long term diet).
anyways, i have done exercise on the atkins diet. i had about 30 pounds that i wanted to drop and drop quickly. i would run an hour a day on it. it's possible, and it's easy. the catch is that you can't perform as well as you would on a normal diet. instead of running at my normal pace of about 5.5 mph, i found i could only keep about a bit more than a 4mph pace.
so obviously, if you're in competition training, or just looking to make improvements, something like atkins isn't the way to go. but if you're trying to lose weight, you can exercise on without difficulty, just don't expect to work at the same level your used to because you're working off of minimal blood glucose and mainly the slower burning fat.
a definate downside to the diet is that you will probably lose some muscle weight. weight lifting might keep you from losing it. the idea is to eat a lot of protein so that the ingested protein is used for gluconeogenisis instead of muscle protein.
finally, if you're gonna do it (saltfish), don't eat bacon... avoid super fatty foods, stick with fish, poultry, some cheese, eat your vegetables, nuts (almonds have been shown to lower BP) and make sure you use supplements (vitamins, calcium, fiber, etc). have red meat and pork sparingly. and find low-carb products that don't have a lot of sat. fats and trans-fats, partially hydrogenated fats.
for clarification, i dont' think it's a good long term thing to be on, but if you've got more than 10-15 "vanity" pounds to lose and can't seem to stick with other diets, i think it's a decent option.
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shabbat shalom, mother fucker! - the hebrew hammer
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