Duck Under

Last updated: May 29, 2026

What is a duck under?

A duck under is one of the oldest ways to get behind an opponent without shooting at the legs. Instead of diving for a single or double leg, the wrestler changes levels, clears the opponent’s arm, and slips underneath it to come up on the other side, now facing the opponent’s back.

That position is the reason the move exists. The back is the strongest place to be in any grappling exchange. John Smith, the two-time Olympic gold medalist, built much of his offense around it. Once a wrestler gets behind an opponent, that opponent loses sight of them and can no longer use their arms and legs well to defend.

The duck under lives in the hand-fighting phase of a match, the tie-ups and grip battles that happen before anyone scores. It belongs to the family of upper-body attacks, alongside the arm drag and the two-on-one, rather than the leg attacks. A fighter does not need to be bigger or stronger to land one. Timing and angle do the work.

How the duck under works

From the outside, a duck under looks like a quick dip and reappearance. A wrestler tied up with an opponent suddenly drops their level, ducks their head under the opponent’s arm, and pops up behind the shoulder with an arm wrapped around the waist.

The setup usually starts from a common tie. One hand controls the head with a collar tie while the other grips the triceps or wrist. The wrestler uses that grip to lift the opponent’s arm, almost like opening a door, which creates enough space to pass the head and shoulders through to the back.

What separates a duck under from a plain level change is direction. The wrestler is not dropping straight down to attack a leg, they are travelling under and around the arm to a new angle behind the opponent. Once there, the hands lock around the waist or hips, and the fighter can drag the opponent down or settle into back control.

Where the duck under is used

The duck under shows up across every grappling style because the goal it serves, getting to the back, is universal.

In folkstyle and freestyle wrestling, it works as both a scoring takedown and a setup for one. A clean duck can lead straight to back exposure, or it can flow into a single leg if the opponent circles away. In Greco-Roman wrestling, where attacking the legs is illegal and every offensive move has to come from the upper body, techniques like the duck under carry even more weight. With leg attacks off the table, getting behind an opponent through a tie-up becomes one of the main ways to score.

The move crossed over into submission grappling, Brazilian jiu-jitsu, and mixed martial arts for the same reason. Coaches at Evolve MMA describe the duck under as one of the common ways to reach back control from standing, since it can be launched from a collar tie, wrist control, the triceps, or an underhook. In MMA, getting behind an opponent opens the door to the seatbelt grip and the rear-naked choke.

Duck under vs arm drag

Newer grapplers often mix up the duck under with the arm drag, since both are upper-body techniques aimed at getting to an opponent’s back. The real difference is the path the body takes.

	Duck under	Arm drag
What it does	Slips the head and body under the opponent’s arm to come up behind them	Pulls the opponent’s arm across the body to slip past it to the side or back
Main action	A level change, going under the arm	Pulling and dragging the arm across
Common grip	Collar tie with triceps or wrist control	Control of the wrist and triceps of one arm
Best moment	The opponent is posting or pushing into the tie	The opponent reaches or extends an arm

In practice, the two often chain together. A failed arm drag can leave a fighter perfectly placed to duck under instead, which is why coaches tend to teach them side by side.

Common duck under variations

Because the duck under can start from so many grips, it has produced a handful of recognizable variations.

The super duck is the best known. It traps the opponent’s arm during the duck rather than letting it slip free, and it grew popular in submission grappling after grapplers like Garry Tonon and Jon Jones used it to take opponents down. Other versions take their name from the grip they begin with, such as a wrist-control duck or a two-on-one duck. The mechanics stay the same. Only the entry changes.

Frequently Asked Questions

Is the duck under a takedown?

Not by itself. It is an entry that gets a fighter to the opponent’s back. From there, it can become a takedown, a throw, or a ride, but the duck under is the part that gets behind the opponent.

Is the duck under legal in all wrestling styles?

Yes. Because it attacks the upper body and not the legs, the duck under is legal in folkstyle, freestyle, and Greco-Roman wrestling, along with BJJ and MMA.

What is the difference between a duck under and a snap down?

A snap down pulls the opponent’s head and upper body toward the mat, usually to attack from the front. A duck under goes under the arm to get behind them. The two pair well together.

Who uses the duck under in MMA?

Fighters with strong wrestling or grappling backgrounds rely on it to reach the back from the clinch. It is a staple entry for anyone hunting the seatbelt and rear-naked choke.

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Sources

1. NBC Olympics. “Wrestling 101: Olympic terminology and glossary.” Accessed May 2026.
2. Olympics.com. “Greco-Roman wrestling: Rules, scoring, and all you need to know.” Accessed May 2026.
3. Evolve MMA. “5 Ways To Get The Back Control From The Standing Position.” Accessed May 2026.
4. Jitsu IQ. “Duck Under.” Accessed May 2026.
5. Fanatic Wrestling. “Duck Under Masterclass By John Smith.” Accessed May 2026.
6. Long Island MMA. “How to do the Superduck.” Accessed May 2026.

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