Excellent answers. Definitely follow Joanne’s reference to the ACSM website. Karin’s suggestion to know the signs of hypo- and hyperglycemia is right on the mark.
Physician clearance and guidelines are absolute. Monitoring blood glucose before, during, and especially after an exercise session is essential. If it’s a relatively vigorous exercise session, muscle glycogen stores will be challenged and the blood glucose level can decline as glycogen stores are replenished.
Good luck. Take care.