Sure, this is totally normal behaviour. See mountain, hike mountain, run mountain. But not when the ridge of the mountain is so ridiculously narrow that you're basically standing on a 2D structure where you can just as easily fall off on either side. But that's nothing to Sebastien Montaz-Rosset, he runs and leaps and jumps all across the edge of the mountain like it's not a big deal at all.
The video, which was pointed out by Digg, is titled 'Evening Jog'. I'll say.