Most often on jogging trails. They tend to stalk people then when they bend down to tie their shoes, land on their backs.
Goes back to animal behavior. They generally dine on deer,and deer have a flat back with an upright neck. With humans the lion often will circle, looking for the flat back (which there is none). But bend down to tie your shoes, and bingo!
I'll keep that in mind should I ever get out west again. I know animals also tend to chase so it's never wise to run from some. I've seen the lions at the local zoo do it when they see a little kid dash across the open area near their pen. That could be why they go after the bikers.