If you have D2 you can and you should do HIT

http://link.springer.com/article/10.1007/s00125-015-3741-2/fulltext.html

D2 patients are usually very badly advised either by their family, some PHYSICIANS OR EVEN THE DIABETIC ASSOCIATIONS.
Many times they are advised to eat sugars with low GI instead of cutting carbs and for exercise they are advised to be prudent and to do the boring LSD endurance training.
This RCT showed the contrary:
do HIT and your heart will better function!
So cut carbs and exercise strenuously...
You will benefit.