From this article The Brief Way to Better Blood Sugar:
Men in a small study who added short, intense bursts of activity to mini workouts seemed better able to metabolize sugars.
When the men were given the equivalent of a meal's worth of glucose at the end of the study, their bodies metabolized it better than before the study.
Researchers suspect that bursts of intensity during workouts elicit stronger contractions and therefore more glucose uptake in the large muscles attached to bones.
The high intensity interval training in this study was performed on exercise bikes. High intensity interval training can also be incorporating into strength training - perform a series of high intensity strength training exercises will little rest between the exercises.