While your response is individual, in my experience, intense physical activity can make blood
sugars high (this is due to the effect of adrenaline and also the liver releasing glucose
). The high may be followed by lows later.
Longer / less intense exercise may not have an immediate obvious impact at the time of exercise or it may make blood sugars go lower. I find long duration exercise will make my sugars go lower many hours later.
What do do?