Learn Russian: Для расслабления после йоги мы используем медитацию. - For relaxation after yoga, we use meditation.

It replaces a purpose clause. Instead of using a subordinate clause with a verb, like чтобы расслабиться (in order to relax), the sentence compresses that idea into a prepositional phrase using для + the Genitive form of the verbal noun расслабление (relaxation). This is a classic example of syntactic compression, making the sentence more concise.

What verb does the noun расслабление come from, and how is it formed?

It derives from the verb расслабляться (to relax) or its perfective pair расслабиться. In Russian, you can frequently create a verbal noun describing a process or state by taking the verb stem and adding the suffix -ение or -ание.

Could we use ради расслабления instead of для расслабления?

You grammatically could, but it changes the tone. Для simply states a practical purpose ("for the purpose of relaxation"). Ради means "for the sake of," which implies a stronger, more emotional motivation or even a sacrifice. In a neutral, descriptive sentence like this, для is the natural choice.

Just as a quick refresher, why does медитацию end in -ю here?