Hello,
I find walking for 30 minutes or more brings my blood glucose down, but more vigorous exercise makes it go up. This might be because I like walking and I relax, rather than the effect of the physical effort involved. I have heard that weight training is one of the best forms of exercise for lowering blood sugar but I have not tried it myself. Before all this diabetes business started I only drank water to give my liver a shock. Now I try to take my 8 glasses a day.