This is the 14758th most frequent Russian word.
плавным
Smooth; flowing.
Here, 'плавного' describes the quality of the transition between stages, implying it should be without abrupt changes, smooth and continuous.
Этот план требует плавного перехода между этапами.
This plan requires a smooth transition between stages.
In this sentence, 'плавными' characterizes the elegance and smoothness of movements, achieving a flowing style through effort or practice.
Его движения стали более плавными после длительных тренировок.
His movements became smoother after extensive training.
Here, 'плавным' is used to describe the tone or quality of the music sound, suggesting it flows seamlessly and is pleasing to the ear.