I'm going to the UK next week to visit my son, and he has a whole gym's worth of weights, bench, etc, so I think I will do two-week exercise-test-test-test, exercise-test-test-test, exercise-test-test-test, etc trial and try to see a pattern. I have to say that I don't find I do absorb spikes, or at least not fast enough to keep my blood sugar in normal range. That's why I stopped trying anaerobic exercise lately. But I do get night hypos sometimes from long walks (you seriously cannot run or cycle in most parts of Istanbul unless you a already super-fit - it's too hilly - so most walking is as energetic as running, especially where I live). So the spike/bolus/night hypo thing is a concern generally. But in London I should be able to use the weights in the morning so that's a help.
If I can get things under control- see a pattern - then I'll buy weights for myself here.