I find the highs from working out, particularly anaerobic things like short, fast runs or lifting (probably circuit training too) seem to be very ephemeral. For running, I set temp basal for 1/2 hour, get ready (10-15 minutes...) run and it'll turn the temp off while I'm still running, if I go fast it usually works out ok, although since I've been running less lately, the individual runs seem to lead to "zippier" insulin response.
For lifting/ pushups/ squats/ etc., I almost always do those in the AM and I have a higher basal beating up DP already and maybe just test, lift and test again. If the first test isn't that high, I'll do a small CB, maybe .3-4U and work out and then see where I'm at and bolus to eat. It really varies every day, I sort of look at the nighttime curve. Sometimes, if I have a couple of really flat BG days in a row, it seems to "turn up" DP so then I'll wake up high and, while it seems like those highs (also liver/ hormone related? hmmm...) are also sort of lighter than the same number from donuts/ cheese fries/ cake, they are still there and I don't like to not fix them.