What Just Dance Really Tracks When It Scores You

In my beginner dance fitness classes I sometimes use Just Dance as a warm-up, and every few weeks somebody discovers the same thing. They notice that a teenager in the back row is scoring higher than everyone while barely moving their legs, flicking one wrist in time with the music. The rest of the class, who are actually doing the full routine and sweating through it, feel cheated. A couple of them have asked me, half joking, whether they are doing it wrong.

They are not. The game just cannot see most of what they are doing. Once you understand what Just Dance actually measures, the score stops being a judgment of your dancing and becomes something more useful: a narrow but honest readout of one part of it.

One hand, one sensor

On current versions, Just Dance tracks a single point on your body. On Nintendo Switch, that point is the Joy-Con, which the game asks you to hold in your right hand with the strap on. On PlayStation 5 and Xbox Series consoles, the recent editions use a free phone app instead, and you hold your phone in the right hand. Whichever device you use, the game reads its accelerometer and gyroscope, which report how the device is moving and rotating, and compares that movement against a recording of the choreographer's hand doing the same routine.

That is all. Your left arm, your hips, your feet, your posture: none of it reaches the scoring system. A grapevine done with perfect footwork and a limp right arm will score badly. The same grapevine done standing still with the right hand tracing the correct path will score well.

The judgments you see on screen (OK, Good, Super, Perfect, and the X for a miss) are ratings of how closely that one hand's path matched the reference within each move. Gold Moves, the flashier poses marked in yellow, are worth more and are judged over a short window, so a late hand costs you more there than anywhere else.

It used to see your whole body

This was not always the case, and the history explains why some long-time players feel the newer versions are easier to fool.

When Microsoft's Kinect camera was supported, Just Dance on Xbox 360 and Xbox One could see a full skeleton. The original Kinect tracked 20 joints per person, and the Kinect for Xbox One raised that to 25, including hand tips and thumbs. PlayStation versions used the PlayStation Camera in a similar, if less precise, way. Harmonix's Dance Central series, built around Kinect from the start, went further and would highlight the specific limb you got wrong in red on the on-screen dancer, which was both helpful and slightly humiliating in a room full of friends.

Kinect was discontinued, cameras fell out of fashion, and Just Dance moved to controllers and phones that every player already owned. That was a sensible decision for reaching more people, but the tradeoff was precision. One wrist-mounted sensor simply knows less than a camera watching 25 joints.

The myth that a high score means good dancing

The common advice I hear, especially from parents buying the game for exercise, is "aim for five stars and you will be getting a good workout". I disagree with that, not because stars are meaningless, but because they reward the wrong thing if you chase them directly.

If you optimise for score, the most efficient strategy is to reduce everything except the right arm. Some players online describe "couch Just Dance", scoring respectably while seated. In a class setting, I have watched people shrink their movements over a few weeks as they unconsciously learn what the game rewards. Their scores go up. Their heart rate goes down.

So in my classes I frame the score differently. It is a measure of your right hand's timing and shape, nothing more. That is still worth something: hand paths in choreography carry a lot of the style, and getting them crisp is real progress. It just is not the whole picture, and it says nothing about whether you are using your legs.

The score is a mirror that only shows your right arm. Use it for that, and look somewhere else for the rest of you.

How I use the score in practice

Here is the approach I give beginners who want to use Just Dance as real exercise and still enjoy chasing stars.

Do every move fully, legs included, and let the score sort itself out. In my experience, people who dance the whole routine end up with scores within a star or so of people who only wave, once they have learned the song. Fully committing tends to make the arm movement bigger and more confident, which helps.

Swap the controller to the other hand for a song. The game will tell you to keep it in your right, and your score will drop, but it is a quick way to see how lopsided your movement is. Most right-handed people are surprised how much weaker their left hand path is.

Track effort separately. If you have a fitness watch, use its heart rate rather than the game's calorie counter, which estimates from the same single sensor. In the sessions where I have compared the two, the game's estimate drifted far from the watch whenever someone danced with big legs and a quiet arm.

Use a mirror or a phone video for the lower body. Prop your phone against the wall and record one song a week. You will see footwork problems the game cannot, and you will see progress the score will never show you.

If you want to understand how scores can still guide practice, the piece on how dance game scoring turns practice into progress goes deeper. For keeping sessions safe and sustainable, I also recommend our tips for dance games as fitness.

Is a camera coming back?

I genuinely do not know. Phone cameras are good enough now to estimate a body skeleton in real time, and some fitness apps already do it, so it is technically possible. The obstacles are more practical: lighting in living rooms is poor, people dance at different distances from the screen, and a camera pointed at your family room raises privacy questions that a wrist sensor never does. I would not hold off buying the game waiting for it.

VR rhythm games are a partial answer, since they track both hands and your head, and some track feet with extra hardware. They feel very different from Just Dance, though, and not everyone wants something strapped to their face for a workout.

Try this on your next session

Pick one song you already know and play it twice back to back. The first time, dance it the way you normally do. The second time, keep your legs completely still and only move your right arm, as precisely as you can. Compare the two scores. If the arm-only run scored higher, you have just seen the limit of the sensor for yourself, and you can stop letting the stars decide how hard you work. More ideas for practice are collected in our games section.