Why Fluently Now?
Mindfulness and learning a second language have certain things in common. First of all, repetition is crucial for learning to master a second language. This is why for me, listening to the same meditation - whether guided or not something like positive affirmations - combines the two in a useful exercise. When you decide to do meditation, other than if you only try a form of practice that is totally silent, you benefit from meditation on a repetitive activity. And if the activity involves a text in a foreign language you get double benefits.
Secondly, the attention to details and decomposing the flow of information into small bits is both useful for language learning but also a good practice for becoming more mindful.