Consider that you will probably burn between 300 and 450 kCal in an aerobics class. Keep the caloric content of the meal below that if you're intending to lose weight. That pretty much lets out any sort of "heavy" meal. The average American's diet is very high in protein, and relatively low in complex carbohydrates, so complex carbs before an aerobic workout are probably better. Keep the total calories from fat to 25% or lower, in general.
This is part of the misc.fitness.aerobics Frequently Asked Questions page (FAQ).
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