Anapana is also listening to the discourses, reading proper Dhamma that leads to Nibbana, choosing to being in Sangha rather in or with ignorant people/places. You wont be able keeping mind pure without it unless you are extremely talented or have enough paramits.
You get into Dhamma with intention of finishing this birth, suffering and future one too realizing the dangers of it, once you go into Dhamma-Sangha-Buddha way you will be pulled off many times and this is when Ariya Anapana gets into practice to stay on the Path, mundane anapana is just being good person which is obviously not enough to attain Nibbana and may be not enough to get into Tihetuka birth.