Eat a nutritious snack of complex carbohydrates (fruit, bread, crackers, cereal, baked potato, pasta, etc.) one to two hours before class to maintain healthy blood sugar levels during exercise. Avoid high fat, high protein and high-refined sugar products at least two hours before your workout. Bringing a snack for after class is a good idea too, as some people experience a drop in their blood sugar after exercise. Packing an apple or string cheese for the drive home is often helpful. ALWAYS bring a bottle of water with you to each and every class.