My highs and lows during exercise really depend on the type of exercise I'm doing. Distance running, for example, makes me go low or, if I start out a wee high, into the "normal" range. However, other forms of exercise (sprinting, anything that involves a rush of adreneline) will ALWAYS make me go high. For those adreneline-filled activities, I always set a temp basal at around 130% and that seems to work. Although I still sometimes come out a bit high, but generally under 220.