Camp punishments could be harsh. Some would be required to assume the "Sachsenhausen salute" where a prisoner would squat with his arms outstretched in front. There was a marching strip around the perimeter of the roll call ground, where prisoners had to march over a variety of surfaces, to test military footwear; between were covered each day. Prisoners assigned to the camp prison would be kept in isolation on poor rations and some would be suspended from posts by their wrists tied behind their backs (strappado). In cases such as attempted escape, there would be a public hanging in front of the assembled prisoners.