Good point, Jennifer. I think reasons vary. I think for women evening exercise can clash with our perceptions of our "duty". It is easier for me now because my son has grown up and left home. But it got easier as he became a teenager, and also now I miss him because we used to walk and cycle and do other sports together. Then there is the safety issue, depending on where you live. Then there's weather. A fine evening is different from a wet one! And, for me, it is better to walk during the day because I need the Vitamin D. Mine is usually very low. Ideally I would walk earlier in the day, but then for me, as a Type 1, it is harder to find a time when I haven't got too much "insulin on board" until late afternoon/early evening. So, I tend to exercise or walk then. Juggling basal and bolus insulin doses for exercise is a bit hit-or-miss, I find. Carbing up seems to produce less error for me, but it also prevents weight loss, if course, and I want to lose 4 more kilos.
This is being diabetic, really, isn't it? So many more factors in every decision.