Not sure what reasons you have in mind.
If you're talking about posture control and balancing Push-ups, then the only good way is Reversed Flies. Either Rings, Suspensions Trainer or Low Weights.
You can do it with BW only by laying on the side and pushing with your arm backwards but it's a bit goofy.
The second exercise that does work it some (though not the same way) is simply Scapula Push-ups... well, when done correctly