A common misconception about exercise and blood sugar is that exercise always brings
down blood sugar levels. Not always.

When you walk an hour after a meal, the blood sugar which had just gone up with your
meal comes down. In other words, if you start walking soon after a meal and walk long
enough, you can actually prevent hyperglycemia that might happen with a high carbohydrate meal. Diabetics can use this hack whenever they eat any meals that are
likely to cause blood sugar spikes.

On the contrary, when you walk brisk on an empty stomach in the morning hours, your
blood sugar goes up. This happens because of the response of your body to fuel the
intense activity that you have undertaken. The body converts the stored glycogen and
fat reserves into glucose. While the low level activities do not cause much increase but
keep getting just enough glucose not to cause low blood sugar, high intensity exercises
like running lead to blood sugar spikes. Such spikes are, unlike food induced spikes,
considered healthy.

There is no need for diabetics to get frustrated with blood sugar spikes caused by
intense exercises in the mornings on empty stomach caused by internal sugar generation. Internal glucose generation helps to maintain glucose homeostasis and
prevents hypoglycemia.

More info... https://www.quora.com/What-is-a-common-misconception-about-exercise-and-blood- sugar-levels-that-often-frustrates-people-with-diabetes

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