Extensors in the arms

Position your hands at an arm’s length from the wall.
The distance between your hands should be slightly greater than the distance between your shoulders.

Take a small step back so that your body leans toward the wall.
Bend and then stretch your arms.

Avoid bending your hips.

Do this exercise a total of 30 times.
Take an appropriate break after every tenth repetition so that your breathing can keep up.