How to count push-ups with your phone camera

To count push-ups with your phone camera, lay the phone on the floor about 4 to 6 feet to one side of your mat, propped against a wall or a book so the lens looks straight down your body in profile. Frame your whole body head to feet, open a push-up counting app, and start. The camera watches your joints move and counts each descent and ascent.

That is the entire setup. No wearable, no chest strap, no tapping the screen between reps. Workout Samurai is one such app, a push-up game where the camera does the counting, but the placement advice below applies to any of them. The rest of this guide is about the details that separate a count you trust from a count you argue with.

Place the phone at floor level, to the side, far enough back to see all of you. Floor level matters more than people expect: a push-up is a movement that happens in the last 30 centimetres above the ground, and a phone propped on a chair looks down at a foreshortened version of it. From the floor, your elbow bend and your chest height are both plainly visible.

1. 1

   Pick the side, not the front or the back

   Stand the phone level with your ribcage, off to your left or right. From the side, a camera sees the two things that define a push-up: how much your elbow bends and how far your chest travels. From directly in front, your arms hide your torso. From behind your feet, your body hides itself.

2. 2

   Set the distance by your body length

   Aim for roughly the length of your body plus a bit. For most adults that is 4 to 6 feet, or 1.2 to 1.8 metres. Too close and your feet leave the frame at the bottom of the rep. Too far and your joints get small and noisy, which is where miscounts creep in.

3. 3

   Prop it at floor height, portrait or landscape

   Landscape usually frames a horizontal body better. Lean the phone against a wall, a skirting board, a water bottle or a stack of books, tilted back about 10 degrees so the lens is not staring at the carpet. A cheap tripod is nice but not necessary.

4. 4

   Check the preview before your first rep

   Get into the top of a push-up and look at the screen. You want your head, hands, hips and feet all inside the frame with a little air at each end. If you have to guess whether your feet are in shot, they are not.

5. 5

   Do two slow test reps

   Watch the counter move. If it registers both, your placement is good. If it registers one or none, come back to the troubleshooting table below rather than grinding out a whole set that will not count.

Either works for counting push-ups. The front camera lets you see the rep count and any on-screen form cues while you train, which most people prefer. The rear camera usually has a better sensor and a wider or sharper lens, so it holds up better in a dim room or at a longer distance.

A practical rule: start with the front camera so you can confirm your framing without getting up, then switch to the rear camera if you are training in low light or if your space forces you to put the phone further away than 6 feet. If you are training to audio cues rather than watching the screen, the rear camera is the better default.

Camera push-up counters use pose estimation. A small neural network runs on each video frame and predicts the pixel position of a set of body landmarks: nose, shoulders, elbows, wrists, hips, knees, ankles. Google's on-device pose landmarker returns 33 such landmarks per frame and is explicitly built for real-time fitness use, and Apple's Vision framework offers an equivalent body-pose request on iOS.

Landmarks alone are not a rep. The counter has to turn a stream of moving dots into a decision. Workout Samurai fuses four signals into a single rep-progress number: elbow flexion, how far the shoulder drops, how far the head drops, and the apparent scale of your body in frame. That number is normalised to you at calibration, so a tall lifter and a short one produce comparable curves.

On top of that sit structural gates, checked at the top of every rep: did you actually reach a depth floor, were your wrists planted, was there a real descent followed by a real ascent rather than a wobble, and was your whole body present in frame. Read more about how that pipeline runs entirely on the phone in on-device rep counting and the AI push-up counter.

A pose model finds your joints by looking at contrast and shape, so three things in your room matter. Light: even and roughly frontal. A window or lamp in front of you is ideal; a bright window directly behind you turns you into a silhouette and is the worst case. Overhead light alone is usually fine.

Clothing: fitted beats baggy. A loose hoodie hides where your elbow actually is, and a very long t-shirt hanging toward the floor confuses where your torso ends. Wear something that contrasts with your floor. Black leggings on a dark wood floor, or a white shirt on a pale carpet, both make life harder for the model than they need to.

Floor and background: a plain background is better than a busy one. Clear anything human-shaped out of frame, including a mirror that reflects you, because a second apparent body in the shot can pull the detector away from the real one. If a housemate walks through the shot mid-set, expect a hiccup.

You need about your body length for the push-up itself, plus 4 to 6 feet of clear sight-line to the side for the phone. In a small apartment that is often the constraint, not the push-up. Three ways to buy space without moving furniture:

• Shoot along a corridor or a wall. Lie parallel to the longest clear line in the room and put the phone at the far end of it, rather than trying to back the phone into a wall that is only 3 feet away.
• Use the diagonal. The diagonal of a small room is usually a foot or two longer than any wall, and that is often the difference between your feet being in frame and out of it.
• Go slightly wide, not closer. If your phone offers a 0.5x ultra-wide lens, it will fit your whole body in from about 3 feet. Edge distortion is a real cost, so keep yourself near the centre of the frame if you do this.

One thing that does not help: raising the phone to get more in shot. A high, downward-looking camera compresses vertical movement, which is exactly the movement the counter is measuring. If you have to choose, take a tighter floor-level shot over a roomier high one.

If a camera push-up counter is behaving badly, work through this table before you blame the app. In practice, framing and depth account for most of it. Find your symptom on the left and change one thing at a time.

It is genuinely annoying to finish a hard set of twenty and see eighteen. Usually nothing is broken. A camera counter measures displacement and joint angles; you measure effort. A rep that was exhausting but only travelled two thirds of the way down is a hard rep and an incomplete push-up, and those are different things.

Workout Samurai runs on a principle we call count generously, score strictly. On the phone the counter is deliberately biased toward recall, so a rep you genuinely did is unlikely to be dropped. The server then validates the submission before it counts toward samurai titles, ranked seasons or your clan totals. The result is that a number you see is a number you earned, which is the only way a leaderboard is worth anything.

The practical fix is boring and effective: slow down. Most disagreements between you and the counter disappear when the descent takes a full second and the bottom position is unmistakable. That also happens to be better training, which is the quiet advantage of letting something else keep score.

The camera is optional. If you deny camera permission in Workout Samurai, the app still works: you do your set and claim the reps manually. The whole workout game is still there, the dojo campaign, the samurai titles and your clan. Manual claiming is the honest fallback for a shared gym floor, a hotel room with nowhere to prop a phone, or simply not wanting a lens pointed at you.

The trade-off is that manual reps carry no verification, so they are held to a different standard where verification matters. If you only ever train at home and you want to see where you stand, the push-up test is a reasonable place to get a baseline number either way.