Everyone went wild over�After School's hot tap-dance routine, and now a behind-the-scenes video for "Let's Step Up" is guaranteed to bring in even more praise for the girls. Performing confidently and with a little sass, the routine would draw screams from audience members whenever the girls brought it out. That being said, it was understood that the members must've thrown in a lot of hard work in order to not only master a new skill, but to deliver it as if they knew it all along. This behind-the-scenes video was taken from After School's rehearsal room, and viewers were left feeling even more impressed by the girls' final product. Check it out below!