Primary: Posterior Deltoids
Secondary: Rhomboids and Traps
The reverse fly exercise machine can help strengthen the back muscles by targeting the upper back and shoulders. This exercise can improve posture, reduce the risk of injury, and enhance overall back strength and stability.
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.
To properly use the reverse fly machine for strengthening your back muscles, sit on the machine with your chest against the pad and grasp the handles. Keep your back straight and slowly pull the handles out to the sides, squeezing your shoulder blades together. Return to the starting position with control. Repeat for the desired number of reps, focusing on proper form and controlled movements.
One effective exercise for targeting the pec fly and rear delt muscles simultaneously is the reverse pec deck machine. This machine allows you to perform a fly motion while targeting the rear deltoids. Another exercise is the bent-over dumbbell fly, where you bend over at the waist and perform a fly motion with dumbbells to target both muscle groups.
Shoulder
You can't. Human muscles can't do it.
[pectoralis major
Performing chest fly exercises on an incline bench targets the upper chest muscles more, while doing them on a flat bench engages the middle chest muscles. Incline chest fly exercises can be more effective for developing the upper chest, while flat bench chest fly exercises are better for overall chest development.
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.....
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.
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.