Primary: Posterior Deltoids
Secondary: Rhomboids and Traps
mainly rhomboids and trapezius
Reverse dumbbell flys, also known as posterior deltoid raises, develop several key muscles areas. They strengthen the posterior aspect of the shoulder muscles called the deltoid. They work the supraspinatus, infraspinatus and the teres minor, which are the posterior muscles of the rotator cuff. Reverse dumbbell flys also target the upper back muscles which pull the shoulder blades toward each other.
Shoulder
You can't. Human muscles can't do it.
[pectoralis major
The muscles used in Pec Fly Exercise are the pectorals (Chest muscles) and deltoids (Shoulder muscles). If done properly and the right sized weight for your ability then you should feel the pulling in your chest and your shoulders.
If you are allowing that we might reverse gravity then 'theoretically' anything else is possible. But, if all we could do is reverse, or negate, the effect of gravity we would float and hover. We would not be able to truly fly, as we have no means of self-propulsion through the air. Now, if we could grow feathers, and lighten our bones, and build muscles strong enough to power our feathered arms.....
Ladybugs, like all animals, have muscles. They need muscles to move, fly, breathe and pump blood around their bodies.
migratory birds have strong wing muscles as they have to fly long long distances and it requires a lot of power to fly very far.
Well, if they were attached to an airplane, yes. There have been a very few man-powered aircraft, but they do not fly well. If you GREW wings, you are still too heavy to fly, and do not have the muscles or the metabolism to feed those muscles.
they like.... fly.. and stuff.
Yes they do have muscles. Or else they can't fly, move an antenna or other things in the world of wasps.
Planes cannot fly backwards.