Place two blocks on the floor, shoulder-width apart.
Kneel in front of the blocks, and lower your torso down so that your elbows are resting on the blocks, and your forehead is resting on the floor.
Relax your arms, shoulders, and neck, and breathe deeply.
Hold for a few breaths, then release.
Child Pose Elbows On Block Exercise Guide - Triceps Workout | MuscleWiki