well ill have to look in to it, but i suggest if you have a low BP, firstly you need to look at your diet. some foods (that are good for you) will help your BP go up. as for exercising. as a safety, where a heartrate watch or something when doing exercises. my first thought would be that the BP would go up coz your heart is pumping more blood through your body. if your BP does not go up, then you will at least see this on the heartrate watch and can stop.. otherwise you'd probably faint or something.