NoFaQA couple observations have me guessing this headlamp might be less than ideal for running. First, the way this light sticks out from the headband means the center of mass is further from the band securing it to your head, which might lead to it bouncing more vigorously. Second, the headband is just a ring, and doesn't have a center strap to cover the top of your head like some headlamps I've seen. These could be issues when you're running, but I can't say for sure since I don't have this unit.