A random study here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3174102/ It says running by itself wont lower A1C. And neither will cardio by itself. But a combination of the two will do it. Another study here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5473541/ This says fast short distance running (not necessarily…