I’m in the pre-diabetic range and have started monitoring my blood sugar just as a precaution. My girlfriend is type 2 and has been on metformin for 15 years. It’s just starting to give her issues but she has also been able to get her A1C under 6 within the past year. Everything hey doctor and nutritionist have told her is that exercise can help lower blood sugar but I haven’t seen that to be the case for me, especially when I’ve gotten myself close to exhaustion.