There is no official ideal blood glucose range to start with and maintain during exercise, but we know that being too low or too high negatively impacts performance. What blood glucose target or range most athletes aim for depends on a number of factors, including the type, intensity, and duration of their activity. A reasonable target for most people doing aerobic exercise lasting up to an hour is 126 to 180 mg/dL (7.0 to 10.0 mmol/L). Read more