Push Ups

Setup
Lie prone on floor with hands slightly wider than shoulder width then raise body up off floor by extending arms straight while keeping body straight (shoulders, hips, knees, and ankles).
Movement Instructions
Lower body to the floor by bending arms while keeping body straight, until chest is just off the ground. Push body up until arms are fully extended. Repeat.
Comments
Keep body straight throughout, do not bend at hips or knees to make movement easier, or lean to one side. Movement can be made easier by performing from the knees.