Tempo Training: What Those Four Numbers Mean

Tempo is how fast each part of a rep happens. Programs sometimes write it as four numbers, like 3-1-1-0. It looks technical, but it is just a way to stop reps from turning into rushed, bouncy movements.

Reading the Code

The four numbers are seconds for each phase, usually in this order:

• First number: the lowering (eccentric) phase. "3" means take three seconds to lower.
• Second number: the pause at the bottom.
• Third number: the lifting (concentric) phase. Sometimes written as "X", meaning as fast as possible with control.
• Fourth number: the pause at the top.

So 3-1-1-0 on a squat means three seconds down, one second pause at the bottom, one second up, and straight into the next rep.

When Slowing Down Helps

• Learning technique: a slow lowering phase gives you time to feel positions and correct them.
• Controlling the weight: it removes bouncing and momentum, so muscles do the work rather than elastic rebound.
• Joint-friendly training: slower tempos let you get a strong training effect with lighter weights, which can help when working around minor aches.
• Pauses: a pause in the hardest position builds strength exactly where you are weakest.

When It Does Not Help

Very slow reps — ten seconds or more per phase — are not better for muscle growth than normal controlled reps. They just force you to use much less weight. Muscle growth depends mostly on how close to failure you train and how much total work you do, not on maximising time under tension.

A Practical Default

For most exercises, lower the weight under control in about two to three seconds and lift it with intent, as fast as you can while keeping form. Add pauses or slower lowering for specific purposes. That simple rule covers most of the benefits.