What are safe blood sugars to have during exercise? Laura Joseph January 06, 2018 17:06 Updated Follow A blood sugar range from 100-250 is safe for exercise for people on a medication regime that includes a hypoglycemic agent. Anything ranging from 154 to 249 is slightly high, but still safe for exercise. Related articles Why is my blood sugar always high in the morning? Comments 0 comments Please sign in to leave a comment.