No offense intended, but I'm a bit skeptical that any exercise can specifically target belly fat. I mean if it works for you, it works, but fat distribution and loss is almost entirely determined by genetics. If you're genetically predisposed to losing fat everywhere else before your belly, then all the belly fat exercises in the world won't work until you've lost it everywhere else.
I don't mean to say this to disrespect your routine, it's just I don't want people to be fooled by snake oil salesmen that say stuff like "This magic tea targets belly fat! Lose weight overnight!" or "Introducing the Abdominator-3000, targets belly fat and strengthens your core!" Just exercising regularly is all it takes.
Anyway, every other day I do a bodyweight strength training routine, and in between days I do cardio by going mountain biking. I know bodyweight training alone isn't going to get me exactly "buff" but it keeps my muscles firm and strong which is really all I'm going for.