Measuring progress without a scale: waist, photos, strength

Why the scale alone is not enough

The scale shows a single total of muscle, fat, water and stomach contents. It does not show what that total is made of. If you lose fat and build muscle at the same time, the two changes can cancel each other out, so the scale stays put while your body changes.

Then there is water, which can shift the daily reading by one to two kilos. The scale stays useful, but only as a weekly average and only as one of several measures. How to tell water from fat is explained in the article Weight going up in a calorie deficit: water or fat?

That your body can change without any weight loss is well documented: an international consensus statement notes that exercise or a change in diet reduces waist circumference, with or without weight loss (Ross et al., 2020).

How to measure your waist properly

Waist circumference is the simplest measure of fat loss around the belly. The main thing is to measure the same way every time. Two measuring points are common: halfway between your lowest rib and the top of your hip bone (the WHO method), or directly at the top of your hip bone. Which one you choose matters less than sticking with it (Ross et al., 2020).

• Measure in the morning, on an empty stomach, after using the toilet and before training.
• Stand upright with your stomach relaxed, do not suck it in. Take the reading at the end of a normal breath out.
• Keep the tape level, snug against your body, without pressing into the skin.
• Measure twice and write down the average.

If you want more detail, add hips (widest part of the glutes), thigh and upper arm, each at a spot you can reliably find again, for example a hand's width above the kneecap. Measuring every two weeks is enough.

Photos you can actually compare

Photos show what numbers cannot: posture, proportions and exactly where something is changing. They are only comparable if everything except your body stays the same.

• Same light and same time of day, ideally in the morning in the same place.
• Same distance and same camera height, roughly at hip level. A self-timer and a fixed spot to rest the phone help.
• Same clothing that shows as much as possible, for example training shorts or a bikini.
• Three poses: front, side, back, each relaxed.

Every four weeks is enough. If you take photos more often, you end up comparing differences that are too small to see.

Strength numbers: your signal from training

You already measure your performance in the main lifts every time you train. Write down weight and reps, for example for squats, bench press, rows or Romanian deadlifts. What counts is the trend over weeks, not the single session.

• When building muscle or during recomposition: weight or reps go up over the weeks.
• During a diet: holding on to your strength is a good sign. If it drops clearly over several sessions, your deficit may be too large.
• One week without progress is not a plateau yet. Only several weeks with no movement at all count.

How to increase the load sensibly is explained in the article When should you increase the weight? Progression made simple. To log your sessions, there is the free training plan template.

What body fat scales can and cannot do

Body fat scales estimate your body composition by sending a weak current through your feet, known as bioelectrical impedance. They are accurate for weight, but not for body fat percentage. In a study of three commercially available scales, the median difference in weight from a DXA reference measurement was 0.3 kg at most. For fat mass, however, the median differences ranged from 2.2 to 4.4 kg (Frija-Masson et al., 2021).

On top of that, the reading depends on your hydration. The European guidelines on impedance measurement state that tracking changes over time is only possible with normal hydration, and even then the results have to be read with caution (Kyle et al., 2004). Anything that shifts your water balance, such as a salty dinner or a lot of training the day before, can therefore also shift the body fat number on the display.

My advice: if you own one of these scales, use the weight and read the body fat number as a rough trend over months at most. A tape measure, photos and strength numbers tell you more and cost almost nothing.

An example: four weeks in which the scale barely moves

A made-up example: someone trains three times a week and eats slightly below their needs. After four weeks the numbers look like this:

If you only look at the scale, you see 300 grams in a month and take it for standing still. The other measurements show what is happening: the waist is getting smaller, strength is going up and the photos confirm it. That is the typical pattern of body recomposition. No single signal is enough on its own. Only when several point in the same direction over weeks can you be sure.

Your measuring routine at a glance

Always compare periods, not single readings, for example the average of the last two weeks against the two weeks before. Visible changes to your body often take six to eight weeks. It is normal for the signals to contradict each other along the way: performance can run ahead for a while before anything shows on your body, or the other way round. Only when nothing moves in any measure over several weeks is it worth taking a closer look at training, nutrition and recovery.

If measuring weighs on you more than it helps, do it less often: weighing yourself once a week and checking your waist and photos every four weeks is enough too. If your thoughts constantly revolve around numbers and your body, talk to your doctor.