With kind permission of Black Mountains Gliding Club (at Talgarth), deafpilotsUK have subtitled a training video on circuit planning.
The circuit is a traffic pattern that gliders and aircraft fly around aerodromes when they are preparing for landing. They are slightly different for gliders and aeroplanes, but are used for the same purpose, to arrive on final approach at the correct location and ensure an orderly flow of air traffic.
You can view the subtitled video below. Many thanks to Wes for transcribing the video.