What do these great souls actually do? Krishna describes three actions: they constantly sing his glories (kirtan), they strive with firm resolve (yatna), and they bow before him with devotion (namaskara). This is their practice — not forced, but natural, like a river that flows without being told.
The words 'satatam' and 'nitya-yuktah' both point to continuity. This devotion is not occasional — not only on festival days or in crisis. It is the steady current beneath daily life.
Three levels of engagement are implied. Kirtan is the voice. Yatna is the effort of body and will. Namaskara is the surrender of the heart. Mind, body, and speech — all three are offered.