"Swinging Obstacles" refers to any fourth qualifier obstacle in Season 1 of Wipeout where the contestant must swing to a goal.
Cookie Cutter Swing
In the Cookie Cutter Swing, competitors swing across a gap with a rope to a platform with a wall at the front of it. The wall has a human-shaped cut-out in it with a foam platform of the same shape inside of it. If the contestant cn swing through, they automatically finish the qualifier. If they fall, they must swim around to the back of the platform, where they will climb up stairs to finish.