mostly qualifying competitions in morning sessions and finals mostly in afternoon sessions. Weather conditions meant that traditional arrangement was not workable and in Doha the schedule was redesigned to have a "pre-session" in the afternoon and a "main session" in the evening. The Khalifa International Stadium used an open-air conditioning system to bring the temperature of the stadium to below , which was a world first for a stadium. In collaboration with Seiko, a starting blocks camera view was broadcast from the Khalifa International Stadium's Block Cams. The intimate views from the blocks were the subject of complaint by the German Athletics Association, which said its female sprinters had not been consulted on the broadcasting of the images. The IAAF agreed to only show Block Cam images of athletes immediately prior to the starting pistol and to delete video data at other times on a daily basis. Gina Lückenkemper said the technology was "unpleasant" as it captured close images of athletes' crotches in tight clothing. The stadium also features an advanced lighting system, which was used in the introductions of some event finals, projecting coloured lines on to the lane boundaries and the competing athlete's names moving around the 400 m track. New graphical detail of athletes' performance was provided in television coverage, including top speed of athletes in the track and jumping events, angle and release speed in the throws, and the distance of each phase of a triple jump. Non-stadium racewalking and marathon events were set on a looped course around the Doha Corniche – a waterfront promenade. Organisers set the start time around midnight local time for road events to avoid the hottest conditions, although the women's marathon still began at a temperature of and humidity over 70%. The IAAF and local organisers undertook preparation for the conditions by recruiting medical experts to inform their preparations, as well as increasing water and refreshments, ice baths, and medical support along the route. It sent advisory notices to all national federations in the six months before the competition with recommendations for athletes. However, postponement of the events until after the championships was deemed a last resort. The IAAF President Sebastian Coe stated his belief that the humidity was a greater challenge for runners than the temperature itself. The Khalifa Stadium hosted the 2019 Asian Athletics Championships in April before the world event. For training and warm-up purposes, an outdoor