A girl jogging, riding a bicycle, skating, skiing, horseback riding, can be joined by a man doing the same, after he asks permission to join her. This is the same situation as a man approaching a girl sitting on a park bench. He is joining her in a recreational activity. known current event will do the trick.

But if the man were to approach her in these activities, not to join her, but to stop her, it would be different. He would then need to have a reason for stopping her, just as he would if she were walking down the street.