I did a little research on the topic--nausea from a workout seems to be caused by two things:
1. hypoglycemia (low blood sugar). Increased muscle use makes the body send out more insulin, which in turn transports all that blood sugar to the muscles, leaving you with low blood sugar. The solution for this apparently is to avoid simple sugars prior to a workout--maybe eat a bagel or some other complex carbohydrate instead.
2. Lactic acid buildup. Lactic acid is a byproduct of muscle use. Not only is it responsible for the 'burn' sensation after a workout; high levels may lead to nausea. The solution seems to be drinking lots of water to help dilute the acid, as suggested by MacGnG and RemyLebeau.
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