With the side-to-side plyo push-up, place one hand on a stable elevated surface and keep the other arm on the floor. As with the all plyo push-ups, the goal is to project yourself explosively. In this variation, you switch hand positions in mid-air. Keep your glutes and abs tight.
Absorb the impact with your elbows at about 90 degrees. Do not lower the chest all the way to the ground.
One of my favorite books is A Book Of Five Rings by Miyomato Musashi. Musashi was a badass 17th century Japanese swordsman who never lost a duel in over sixty fights. This book outlines his philosophy of success. I re-read it recently and was amazed by how many of his principles apply to a variety of areas in life, including productive strength training.