Well for a person with a functioning pancreas that is fine, but for us diabetics it will cause a spike in our blood sugar. You have to be careful though because exercise can and will affect blood sugar levels up to 6 hours after it has been completed. That means your blood sugar will drop later in the day after exercise so you have to continually monitor your blood sugar. I am 21 and my last HbA1C was 6.2. I am also on an insulin pump, something I would recommend to everyone who wants to make an honest effort to controlling their diabetes.
Exercise is key to keeping diabetes under control and to staying healthy.
But you have to test your blood sugar early and often. That is scary. Testing will only help your situation. Any question please feel free to email me. I have seen alot of good ways to go about diabetes control and alot of bad ways.