Dumbbell single leg box squat press

How to do it

1. Step oneSit on a box with your feet flat on the floor, holding a dumbbell at shoulder height in the hand opposite the leg you will stand on.
2. Step twoLift the other foot clear of the floor and hold that knee bent, so only one foot is loaded.
3. Step threeStand up on the planted leg, keeping your pelvis level, and press the dumbbell overhead as you rise until your arm is fully extended.
4. Step fourLower the dumbbell back to shoulder height and lower yourself under control until you are sitting on the box again, keeping the free foot off the floor throughout.
5. Step fiveComplete all repetitions on one side before switching legs and hands.

What usually goes wrong

The box is a seat, not a platform

Your foot never touches the top of it. You begin sitting on the box and finish standing on the floor beside it, and the box spends the whole set underneath you rather than in front of you.

A step-up is built the other way round. The working foot goes onto the platform first and the rest of you climbs to meet it, so the platform decides the height you have to reach. Here it decides the height you start from, and a taller one makes the movement easier rather than harder.

The reason to keep them apart is that they fail differently. A step-up gets rescued by the trailing foot still on the floor. This gets rescued by the seat, either by dropping onto it or by pushing off it, and both of those look like a completed repetition from the outside.

What standing up on one leg is actually good at

This shape has a second life outside the gym as a measurement. Timed one-leg sit-to-stand performance was checked in 40 young adults and repeated almost exactly, an intraclass correlation of 0.960 between two sessions, and the times correlated with concentric peak strength across every lower-limb muscle group put on the dynamometer. Force-plate versions of the same test have since been reported as reliable in trained adults.

Read that for what it says. The movement is a repeatable way of asking one leg a question and getting the same answer twice. It is not a claim that the movement builds that leg better than exercises whose weight you can keep raising, and none of those studies looked at training with it.

So the honest use is a check and a piece of practice. If one side takes visibly longer to leave the seat than the other, that is worth knowing, and it is precisely the thing a two-legged squat covers up.

What it is for

The dumbbell single leg box squat to press is a unilateral exercise performed between a box and the floor. You sit on the box with one foot planted and the other leg held clear, stand up on the single planted leg, and press a dumbbell overhead with the opposite hand as you rise. It targets the quadriceps of the standing leg, with the gluteus maximus extending the hip and the deltoid and triceps pressing, while the abductors of the standing hip hold the pelvis level.

Questions people ask

What muscles does the single leg and arm squat press work?

Doing the work: the quadriceps of the standing leg extend the knee to lift you off the seat, the gluteus maximus of that leg extends the hip, and the deltoid presses with the triceps finishing the elbow. Holding position: the abductors at the standing hip keep the pelvis level, the obliques resist a dumbbell hanging off the far side, and the hamstrings co-contract with the front of the thigh rather than driving anything. The catalog lists quads, glutes, delts and abs, which covers the first group and leaves the standing hip out entirely.

Why is there a box in the video when the catalog record never mentions one?

Because this exercise's own record was written without it. The record has you lower into a single-leg squat; the demonstration sits down onto a box and stands back up off it, twice, on the same leg. That is not a detail. The box sets the depth, holds you between repetitions and is what makes the movement repeatable for most people at all. This page is written from the footage, and the record has been flagged rather than followed.

Is this a step-up?

No. Your foot never goes on the box, so nothing here is a climb. You sit on it and stand up off it, which makes it a seat. The exercise where the foot goes up onto the platform is the step-up, and it has its own entry.

How high should the box be?

High enough that you can leave it on one leg without the free foot touching down, and no higher than it needs to be once you can. In a two-legged sit-to-stand the peak hip and knee moment stopped rising once the seat dropped below about 40 cm (16 in), so a very low box mostly buys travel, and it is also the height at which the free foot starts helping.

How heavy should the dumbbell be?

Light enough to hold overhead while standing on one foot. The two halves of the repetition have different ceilings, and the arm sets the lower one by a wide margin, so the weight you end up with is decided by the press and not by the leg. If a number matters to you that day, the leg and the press are better trained separately.

Should the dumbbell be in the hand opposite the standing leg?

That is what the demonstration does, and it is the arrangement that asks most of the standing hip. In 24 healthy adults walking with a load in one hand, carrying it on the far side produced the highest gluteus medius activity of any position tested. That is walking rather than standing up off a box, so it tells you which way the effect runs and not how big it is here.

Do I have to sit all the way down on the box?

Touching it is what keeps every repetition the same size as the last one. Hovering above the seat turns depth back into something judged by feel, which is the exact problem the box was solving. Arrive, settle, stand.

Why is this rated advanced?

Because coordinating a one-legged stand with a one-armed press is difficult to do tidily, not because the dumbbell is heavy. Those are separate things, and the rating is about the first one. A movement can be hard to perform and still be a light exercise.