Give an example of an isometric contraction?

Pushing a wall without bending or motion in the arm joints.

Explanation:

Isometric literally means that the measurement of a particular thing does not change.

Here isometric contraction is related with the contraction of the muscles without the movements of the joints. During the process the muscles feel the load and muscle fibers contract without change in length.

Every contraction of muscles in the skull is isometric.

A classic instance of an isometric contraction would be to bear an object before you. The object's weight will be pulling down, but the movement of the object would be opposed by your arms and hands with equivalent force pushing up the object.

Assuming that your arms do not lift or fall, your biceps will contract isometrically. Isometric contraction generate force without changing the length of the muscle.