The Chest Muscles action is, Arm adduction and rotation, flexion and extension of the Shoulder Joint and depress, rotate and protract the Scapula (Shoulder Blades)
The major Action (Movement) involved during Chest Exercises is Flexion (Concentric Contraction) and Extension (Eccentric Contraction) at the Shoulder Joint and Extension (Concentric Contraction) and Flexion (Eccentric Contraction) at the Elbow Joint.
The Pectoralis Major and the Anterior Deltoid work in harmony together. The Pectoralis Major moves powerfully in push-ups, pull-ups and throwing actions (tennis serve, etc...). The Pectoralis Minor assists with Pushing actions, i.e. pushing your hands out in front of your body.
COMPOUND OR ISOLATION?
The Exercises used are Compound because there is more than one Muscle Group being used.
Balls and Bands Workouts, recommended Chest Workout Routines are:
Exercise Ball Chest Press.
Exercise Ball Seated Press.
Standing Two Arm Chest Press.
Exercise Ball Chest Fly.
Standing Chest Fly.
Standing Single Arm Fly.
Some of the most popular Resistance Band Exercises are those that work the Chest and when developed properly these Muscles will contribute to additional Upper Body Strength and an attractive appearance.
Remember to always "Workout Safely" using your common sense and proper technique, ""Position and Posture".
These Exercises are easy to learn and effective, so don’t be surprised if they become your favourites.