nothing
shoulder flexion shoulder adduction shoulder horizontal extension
Trunk flexion & unilateral trunk flexion.
trunk flexion lateral trunk flexion
The primary muscle intended for exercise.
While performing a hanging leg raise one of the intended actions of the primary muscle, the iliopsoas, is to flex the thigh and the trunk during the exercise. Other primary muscles include the rectus femoris, tensor fascia lata, and adductors.
The primary action of the trapezius muscle during shoulder shrugging movements is to elevate and retract the shoulders.
The Agonist muscle. In contrast, the muscle group that has passive action(the muscle being stretched) is called the antagonis muscle. For example, when doing a bicep curl. Your biceps are the agonists and your triceps would be the antagonists.
The primary mover.
The occipitalis muscle pulls the scalp back, and to some extent can wiggle the ears. It creates a look of startle or surprise on the face. It can be involved in headaches by staying tense for too long.
The biceps brachii muscle is the primary muscle responsible for the down-stroke action at the elbow when hammering a nail. It is located on the front of the upper arm and is crucial for flexing the elbow.
Elevation of the humerus and slight medial roataion of the shoulder. The anterior deltiod is a semi-weak muscle.
The Zygomaticus is the primary muscle used in smiling.