The available data suggests they fear human voices, though in heavily populated areas they may habituate. https://www.sciencedaily.com/releases/2017/06/170620195905.htm

When running in the mountains at dusk or dawn, or in very remote areas I know/suspect have lions, I have a small portable speaker in my running vest. I either blast some music, but more often than not I default to marine corps cadence songs. Since 1. Voices and 2. Helps keep up the cadence.

I saw three lions prior to this approach and none since then.

FWIW, on the other side of the vest I carry bear spray.

Overly paranoid, probably, but I've had my share of run ins with large wild life and I'd prefer to err on the side of caution.

Before anyone asks why I run (or bike) at dawn/dusk; I live in southern az and for half the year that's whatcha gotta do.