How to Track Body Measurements for Fitness Progress

Most people use the scale as their only measure of progress. The problem is that your weight can swing by 1-2 kg in a single day depending on water, food, and sodium intake. Worse, if you’re building muscle while losing fat, your weight might not change at all — even though your body composition is improving.

Body measurements fix this. A tape measure doesn’t lie about whether your waist is getting smaller or your arms are getting bigger.

What to measure

You don’t need to track everything. Start with these six measurements:

1. Weight — still useful as one data point, just not the only one. Weigh yourself at the same time each day (morning, after using the bathroom, before eating) for consistency.
2. Waist — measure at the navel. This is the single best indicator of fat loss for most people.
3. Chest — measure at the widest point, across the nipple line. Useful for tracking upper body development.
4. Hips — measure at the widest point of the glutes. Relevant for overall body composition changes.
5. Thighs — measure at the midpoint between the hip and knee. Tracks leg development from squats, lunges, and deadlifts.
6. Biceps — measure at the widest point with your arm relaxed at your side. The classic metric for arm size.

How often to measure

Take measurements every 2-4 weeks. More often than that and the changes are too small to see. Less often and you lose the trend.

Pick a consistent day and time — for example, Sunday morning before breakfast. Consistency in when you measure matters more than which day you choose.

How to take accurate measurements

• Use a flexible tape measure (the cloth kind, not a metal one).
• Keep the tape flat against your skin, snug but not tight.
• Measure the same spot every time. If you measured your waist at the navel last time, measure at the navel this time.
• Stand relaxed. Don’t flex, don’t suck in your stomach.
• Take each measurement twice. If the two numbers are more than half a centimeter apart, measure a third time and use the middle value.

Reading the trends

A single measurement on its own doesn’t tell you much. What matters is the direction over time:

• Waist going down, weight staying the same: you’re losing fat and likely gaining muscle. This is the best possible outcome for a recomposition.
• Weight going down, arms and chest staying the same: you’re losing fat without losing muscle. Your training is working.
• Everything going up: you’re in a bulk. Check whether the waist increase is proportional to the other measurements. If your waist is growing much faster than everything else, you’re gaining too much fat.

Tracking measurements in Logged

Logged has a dedicated body tracking section where you can log weight, chest, waist, hips, thighs, and biceps with a date for each entry. The app charts your measurements over time so you can see trends at a glance.

Combined with your workout data, this gives you the full picture: your strength is going up (tracked through your training logs), your body is changing in the right direction (tracked through measurements), and you can see both in the same app.

What to read next

• Why You Need a Workout Log (And How to Start) — body measurements show the outcome, but training data shows the input. Track both.
• How Many Rest Days Do You Actually Need? — recovery affects body composition as much as training does.