Every fitness app advertising in the EU starts with an English workout line and runs it wide. What separates them is what happens next, and how long they let each translation live. Apple's public Ad Repository, the transparency dataset the EU Digital Services Act requires, shows the actual language and country of every App Store ad. We read the fitness advertisers through it. Data window ends 18 July 2026.
The English hero runs wide first
For the apps that hold winners, the longest-running creative is English and English carries the widest footprint. Muscle Booster's "Gym, Home Fitness, Calisthenics" runs in 14 countries and is over a year old. Freeletics' "Bodyweight, HIIT Fitness Coach" runs in 5 and has run 341 days. Fitbod's "Strength Training & Fitness" is over a year old too. One English creative in a dozen or more storefronts is the cheapest way to learn whether a workout hook converts, so that is where the disciplined spenders start, and they leave it running once it works.
The translation is a clone, with one drift
When these apps translate, they mostly keep the exact feature bundle and change the language.
Freeletics is the clean case. Its English line names bodyweight and HIIT training. Its German line, live since March 2026, is "Workouts, Muskelaufbau Zuhause" (workouts, muscle building at home). Its Spanish line is "Ejercicios en casa - workout" (exercises at home). Its Portuguese-and-Swedish line is "At-home & gym training workout". Same idea, home and gym training, in four more languages. Nothing is repositioned.
Muscle Booster runs the same play with one tell. Its English survivor stays on the exercise, "Gym, Home Fitness, Calisthenics", but its German clone, live since April 2026, is "Abnehmen mit calisthenics" (lose weight with calisthenics). The German market gets an outcome word the English line never uses. It is a small drift, and it is the exception that proves the rule: the lines that have run longest, in every language, name the workout, and the moment a line reaches for the body it is a newer, shorter-lived test.
The reason the clone approach works is simple. When your hook is a concrete activity, calisthenics is calisthenics in any language, so translation is a swap, not a rewrite. That makes localizing a workout app cheap and low-risk, the same way it is for any utility.
The heaviest localizer churns the fastest
BetterMe is the counter-example, and the most instructive one. It runs the widest localization in the category: a "Pilates, Calisthenics, Yoga" line that Apple records across German, English, Dutch, and Swedish at once, live in 18 countries, plus fresh Portuguese ("Pilates, Calistenia, Ioga"), French ("Pilates, Callisthénie, Yoga"), and Spanish ("Pilates, Calistenia, Yoga") clones it added in June 2026. The translation discipline is textbook: same three activities, six languages, no repositioning.
But none of it is old. BetterMe's widest line is 137 days, its per-language clones 21 to 29 days, because it rotates creative constantly rather than holding a winner. So localization breadth and localization durability are two different things. BetterMe wins on breadth and loses on durability; Muscle Booster and Freeletics do the reverse. If you are learning from a rival, separate the two: how many languages it runs tells you where it sees demand, but how long each translated line survives tells you which translation actually converts.
What a founder should do
If your app has a utility hook, and most workout apps do, copy the disciplined version. Write your ad around the concrete activity a searcher wants, gym, home, calisthenics, HIIT, strength, not the body your app promises. Run it in English across every EU storefront you can, cheaply, and let longevity tell you whether it converts. Then translate it literally into your two or three biggest non-English markets, and keep the activity in the words, not the outcome. Watch what survives: a rival adding a native clone tells you which market it found worth the cost of translation, and a rival whose clones all die young, the way BetterMe's do, is testing, not proving. Check monthly.
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Method note: figures are computed from Apple's public Ad Repository (DSA Article 39), across 25 EU storefronts, data window ending 18 July 2026. Country counts are the distinct storefronts a creative ran in; language is the ad's declared default language tag, and some creatives declare more than one. Translations shown are literal glosses of the advertisers' own lines, for readers who do not speak them. Longevity is a proxy for performance, not a measured conversion rate. We invented no numbers beyond what the repository reports. Refreshed monthly.