Fitness will not cause hypoglycemia, and your blood sugar result may be just exercise. Blood sugar is used for energy supply, so it is low. However, hemoglobin is indeed related to health. People who exercise will have higher hemoglobin. Because the body needs a high oxygen supply capacity, it will promote the body to produce more hemoglobin. Not a bad thing.
The main thing is to pay attention to blood sugar, and then test it when you don't exercise in a few days.