A fun way to practice specific German sounds is by reciting tongue twisters. The benefit to using tongue twisters as a learning tool is that you get to practice the same target sound not only repeatedly and but also in differing configurations. This is important because neighboring sounds influence one another. Practicing individual sounds in isolation is useful, but is ultimately only a precursor to being able to pronounce the sounds in combination with others.
Here are 14 German tongue twisters or “tongue breakers” with audio. Viel Spaß beim Üben!