What's to elaborate? It describes those who dwell in the forest, not in a monastery. As Ajahn Mun did for much of his life.
"When one thing is practiced & pursued, ignorance is abandoned, clear knowing arises, the conceit 'I am' is abandoned, latent tendencies are uprooted, fetters are abandoned. Which one thing? Mindfulness immersed in the body." -AN 1.230