Girls' Generation have revealed a behind-the-scenes look at their choreography practice for "Forever 1".

In the video above, Girls' Generation learn the choreography for their long-awaited comeback track individually and with their fellow members. Fans also get to see the girl group goof around with each other and with the camera. "Forever 1" is the title song of their 7th album of the same name, which marks the SM Entertainment girl group's 15th anniversary since debut, and the upbeat track is about their unchanging energy and love for fans.

Watch Girls' Generation's behind-the-scenes video above, make sure to turn on the English captions, and check out the MV here if you missed it.