Hook, body, CTA
Hook, body and call to action is the three-part structure most performing short video ads follow. The hook earns the next two seconds, the body makes exactly one argument and shows it, and the call to action names the next step. The structure matters because the three parts can be varied and measured independently.
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Why it matters
Separating the parts turns a vague question, "why is this ad not working", into three answerable ones. A low hook rate means the opening failed. A high hook rate with low completion means the body failed. Good completion with low click-through means the call to action or the offer failed.
How to apply it
| Part | Length | Job | Diagnostic metric |
|---|---|---|---|
| Hook | 1 to 3s | Earn attention, qualify the viewer | Hook rate |
| Body | 6 to 20s | One claim, demonstrated | Completion rate |
| CTA | 2 to 4s | Name the action unambiguously | Click-through rate |
- State the offer before the halfway point. Most viewers never reach the final two seconds.
- One claim per ad. Two claims in 15 seconds means neither is remembered.
- Vary the hook first, because it has the largest effect and the shortest lifetime.
What people get wrong
- Putting the offer only in the CTA, where most of the audience never sees it.
- Opening on a logo or a title card, which spends the hook on branding.
- Treating the body as a feature tour rather than as one demonstrated claim.
- Recombining the same three parts and calling the outputs different ads. They make the same argument.
Frequently asked questions
How long should each part of a video ad be?
Roughly 1 to 3 seconds of hook, 6 to 20 seconds of body and 2 to 4 seconds of call to action, with the offer stated before the halfway point.
Which part should I test first?
The hook. It has the largest effect on outcomes and fatigues fastest, and it is the only part every impression actually sees.
Does every ad need a spoken CTA?
No, but it needs an unambiguous one. An on-screen CTA with a clear action works, particularly in muted placements.