On April 20th, rookie girl group Brave Girls released a rehearsal video for the choreography of their debut track, "Do You Know". Although they were wearing comfortable attire, netizens claimed that they could feel the sexiness of their performance thanks to their beautiful long legs and sophisticated choreography. Fans also got a better glimpse of the ballet bar that's been utilized in their performances these past few weeks. Check it out below! Source: Newsen via Nate