# Automatic gym machine rep counters: what works and what to check

> How automatic rep counting on weight-stack machines works, what the sensors measure and what to check before buying.

[Guides](https://nomae.com.au/guides) · 4 min read

If you use the same gym machines every week, counting reps and recording sets takes attention away from training. An automatic rep counter can help, but different methods work in different ways.

## Three ways to count reps at the gym

- **Manual workout logging.** Enter your weight and reps into a workout app after each set. It works on almost any exercise, but you do the counting.
- **Wrist-based tracking.** Some watch apps estimate reps from arm movement. Whether they work well depends on the exercise, how you move and how the app recognises the pattern.
- **A sensor attached to the moving weight stack.** A motion sensor follows the machine's moving stack rather than your wrist. This suits compatible machines with an accessible, moving steel weight stack.

## What does a weight-stack rep counter actually measure?

A tracker attached to the moving stack uses motion measurements to estimate each repetition. Depending on the device and software, movement data can also be used to describe how a rep changed over the set. The tracker does not automatically know which weight you selected: you still need to enter that in the app.

It also isn't a perfect judge of technique. A partial rep, bump or unusual machine movement can confuse automatic counting, so the ability to check and correct a set matters.

## Check your gym machine first

- **Moving surface.** Is there an accessible metal surface that rises and falls with the selected weight?
- **Material.** A magnetic tracker needs ferromagnetic steel where it attaches. Some covers, coatings and machine designs may prevent a secure fit.
- **Clearance.** The device must not interfere with guides, pulleys, cables, covers or nearby moving parts.
- **Exercise type.** A tracker designed for selectorised weight stacks is not automatically suitable for free weights or plate-loaded machines.

Check compatibility for each machine and never attach a device where it could snag, detach or obstruct moving equipment.

## Look beyond the rep count

The most useful question is not just how many reps you did, but whether you made progress at the same exercise and selected weight. Keep your weight, reps and workout history together so you can compare later sessions. If a product claims to show rep speed or range of movement, look for a clear explanation of what its sensor measures and how those measurements were validated.

## Where NOMAE fits

[NOMAE](https://nomae.com.au/tracker) is a magnetic tracker designed for compatible selectorised gym-machine weight stacks and a free iPhone workout app. It's built to count reps and show movement trends, without requiring a subscription for core tracking. The hardware is still undergoing real-world validation; published compatibility and performance claims will depend on those results.

Where NOMAE fits

NOMAE is designed to sit on a compatible moving steel weight stack and send rep data to its free iPhone app. Check the machine fit and current availability before ordering.

[Order · A$199 to 4 November](https://nomae.com.au/tracker#launch)

[Will it fit my machines?](https://nomae.com.au/fit)

General information about training, not medical or personalised advice. If you have an injury or a health condition, check with a doctor or physiotherapist first.

## More guides

[**What is NOMAE? The gym machine rep tracker explained**: What the NOMAE gym tracker does, which machines it fits, the free iPhone app, prices and availability in Australia. · 3 min](https://nomae.com.au/guides/what-is-nomae-gym-tracker)

[**Progressive overload on gym machines: a simple system**: Machines make getting stronger easy to measure, if you know what to change and when. · 5 min](https://nomae.com.au/guides/progressive-overload-on-machines)

[**Rep speed: why the same weight moving faster means you're stronger**: Before the weight goes up, the speed does. Here's how to read it. · 5 min](https://nomae.com.au/guides/rep-speed-and-strength)

[**How to set up a gym machine, and remember it next time**: Seat height and pad positions change every lift. Get them right once, then keep them. · 6 min](https://nomae.com.au/guides/set-up-gym-machines)

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Source: https://nomae.com.au/guides/automatic-gym-machine-rep-counter
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