First have your child stand a few steps away from the wall. Then have them lean forward and place hands on wall. straighten arms to push back to a standing positon, bend elbows to bring face closer to the wall.
Child can also do these push-ups at a during the de-escalation process. positon body at the edge of the table and press down with hands on the table top. repeat this technique as needed or until child is calm. 
Calming Techniques for Escaladed Children at Home 