As a result, you'll be placing your pecs under significant tension both at the very bottom of the movement all the way into the fully contracted position. (seannal.com)
Extend your spine so that your head is slightly lower than your hips at the bottom of the movement. (fitnessandpower.com)
For maximal benefits, you need to perform each exercise according to the prescribed tempo code — the first digit refers to how long (in seconds) it should take you to lower the weight, the second digit indicates how long you should pause at the bottom of the movement, the third how long it should take you to lift the weight, and the fourth tells you how long you should pause at the top portion of the movement. (fitnessandpower.com)