This is a great exercise. The purpose is just to get your fingers "to go". No phrasing is present here; just a stream of notes to get your fingers to be able to keep going. Naturally, you should combine this exercise with real phrasing and some rests, of course. I like to practice this way for a while, then when my fingers can "go", I start focusing on real phrasing and melodic lines.
https://www.youtube.com/watch?v=L60qQASGjOo
