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I'm gonna be honest with you - most free fitness apps make their money through ads or premium features, that's just how the business model works. What I actually use are YouTube channels from trainers that are completely free, and you get to decide which workout you do yourself - zero ads in between if you use an adblocker. Otherwise you could also check out open-source projects that are community-driven, but then you need a bit of self-motivation because the interface often isn't that fancy.
What kind of training are you actually interested in - strength, endurance, flexibility, or more like a mix of everything?
The annoying reality is: truly free apps without ads are pretty rare these days. Most of it is either free with annoying ads or paid. That said, there are a couple that are way less intrusive. Open Workout and Strong are decent examples - with Strong you pay a small one-time fee or get the basic version free without crazy ad bombardment. Open Workout is genuinely free and the community side is pretty solid, ads stay pretty much in check.
If you're okay with free YouTube videos, you don't even need an app. There are channels with really good content - just search for whatever you want to train. Costs nothing, no app popups, and you can download offline if your provider allows it. Some people prefer that because it's less distracting than an app full of notifications.
OpenFitness has turned out to be decent for me - genuinely free, open source, and no annoying banners. You do have to know what you want to train, but the exercises are explained well and it doesn't constantly pester you with premium popups.
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