A woman visiting Zion National Park drew criticism for putting herself at risk as she posed outside the railing of the Canyon Overlook Trail. A video shared on the Tourons of National Parks (@touronsofnationalparks) Instagram account shows the woman holding on to the rail as she leans her torso forward with her left leg on the cliff's edge. Meanwhile, she bends her right leg to reach the top of her head and later sits on the ledge barefoot. Vie…