I try to stick with pushups and squats, as the two leave no traces in my, just a force of habit, and I jog everyday for a while out except sunday, I am not fit yet but if I had to define myself I don't look like stuffed bringal anymore, and I look considerably slimmer after 4 months of routine, I did learn the key is to not go out of your way but to do it in moderation and always, we always HAVE to stick to routine, I still do have some belly fat, but I am confident I will be able to lose it if I keep going on.
PS: situps are quite helpful in building the abs but I don't do them, still I suggest to.