I hate to exercise because i can't seem to keep my blood sugar from plummeting. It's illogical for me to change my basal rate completely because i know i'm not going to exercise every single day at the same time each day. But i haven't managed to figure out the right temporary rate yet. This moring i set it to 75% my normal basal rate and set it to last for twice as long as i was going to exercise for. it went low after. I think it might work if i go for 50% of my normal rate for the same duration. I tried it at 50% last night, but i think i only did it for the time that i was actually exercising. It didn't work out very well and i swung a little high, but i had also been compesating for an earlier low. Hopefully i'll get it all straightened out soon. Trial and error...the story of life with diabetes.