Push
Typewriter push-ups are named for the lateral slide at the bottom of the rep, like a typewriter carriage. That slide creates intense isometric tension in the chest on the side you move toward.
From a very wide plank, lower until the chest is at hand level. WITHOUT coming up, slide laterally until that arm is nearly straight and the other is deeply bent. Slide to the other side. Then press up. That is one full rep.
In the slid position, the pec on the bent-arm side holds body weight in a max isometric contraction—extremely demanding.
Increase pause time on each side during the slide.
Pressing up between slides (incomplete rep); hip rotation during the lateral slide.