Repetition tempo is the speed or count of a lift; time under load tension. A lift consists of 3 movements: Concentric Contractions—muscle actively shortening, Eccentric Contractions—muscle actively lengthening and Isometric Contraction—muscle actively held at a fixed length. Depending on your goal, each of these movements is assigned a count.
Tempo variable may look like this: 4/2/2. Its meaning: 4 seconds to lengthen the muscle, 2 second hold of the load and then a 2 second shorting of the muscle. Let’s take a bicep curl for instance. Holding your arm at your side, you curl up or shorten the muscle by bring a dumbbell up to your shoulder in 2 seconds, then hold the dumbbell still for 2 seconds and then lower your dumbbell or lengthen the muscle in 4 seconds. This is repetition tempo.