Which workout app shows the muscles you trained?

The short version: Chango shows every muscle you trained on a 3D figure. After a workout the muscles you worked light up, and over a week, a month or a year each one glows as far as it has reached its weekly target. You can turn the figure around and see at a glance what got enough work and what didn't.

Why a picture beats a list of numbers

Most workout apps keep a log: dates, exercises, sets and weights. It's all there, but it's hard to read. After a few weeks you can't easily tell whether your back got as much work as your legs, or whether your shoulders were forgotten altogether.

A picture answers that in a second. Research on goal pursuit shows that keeping an eye on your progress helps people reach their goals, and the effect is stronger when the progress is made visible or written down [1]. That's the idea behind Chango's figure: instead of reading your training, you see it.

Why the figure counts sets, not just workouts

Seeing that you trained your chest isn't the whole story. What builds muscle is how much work each muscle gets over the week, and research links more weekly sets with more growth [2].

So Chango doesn't just mark a muscle as trained. Each muscle has a weekly target, and its glow on the figure shows how far it has got. A muscle that reached its target glows fully; one that got half of it glows half as much. Muscles that help in an exercise count too, at their share: a chest press also works your triceps and the front of your shoulders.

Why the whole body matters

The World Health Organization recommends strength training for all the major muscle groups [3]. That's easy to say and easy to miss in practice, because most people have favourite exercises and forget the rest.

On the figure, a forgotten muscle stays dim. You can turn the figure all the way around, so the back of your body, which is easy to overlook in a mirror, is just as visible as the front. And you don't have to fix the gaps yourself: Chango plans your next workouts around the muscles that are behind.

Why you can look back a week, a month or a year

One good week is nice, but what changes your body is what you do over months. In Chango's progress view you can switch between your last day, week, month, half year and year. Over the longer periods each muscle glows by how much of its weekly targets you reached, so a break shows honestly as a dimmer figure, and steady training shows as a bright one.

You can choose your figure too: Chango the monkey, a woman or a man.

What else the figure tells you

The same figure shows recovery. The Recovery view shows which muscles are ready to train and which still need time, so you can see why today's workout is what it is. And if you import your other workouts from Apple Health or Health Connect, like a run or a padel game, they show on the figure too.

What you'll notice

The figure changes the question you ask yourself after a workout. It's no longer "did I train today?" but "did I train enough, and enough of everything?" Over a month or a year, you'll see the answer light up.