Originally Posted by deeaa
Yep that's what I meant, only IMO it's better to sing several notes' runs, just change the starting point always a step (or half) higher.
That's because if you just keep going lower and lower or vice versa, it can be pretty exhausting. If you do the same going like 'la la la la la' and then the same a tad higher, you get to 'rest' the voice because you also sing already familiar notes in the same run, and then the highest may slip out correctly easier than constantly just straining higher.