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Zafirah, keep in mind that they are talking about how much cardio is "too much" for the specific purpose of losing weight.
Obviously athletes who train for hours a day are not destroying their bodies (assuming they are eating and training sensibly) but you need different amounts of cardio and strength training, and you have different nutritional requirements if your goal is to lose weight, or if it's to achieve a specific level of fitness, to train for some kind of athletic competition, or any other specific reason people working out.
I think that's where some of the disconnect is coming from, since I suspect some people are talking about what kind of excercise you need to burn fat, and others are talking about what you need to build up your cardiovascular fitness.
As for how many calories you need, I am very suspicious of that 2,000 calorie amount you mentioned earlier, I think for many women, it is quite a bit lower.
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