The best way to learn a language is to speak with a native. It’s not always possible. If you are in the mood to do exercises alone, it is an excellent point to use eyes, hands, mouth, and ears at the same time.
We propose texts for drill. You should go through it sentence by sentence. Read aloud a sentence, understand it, memorize it, write down, check it, repeat, or go next. So your brain will be boosted by a grate level of attention you are giving to a text.
And yes, its hard work, like in a gym.