Rookie girl group CLASS:y has just unveiled a secret to their training regime that they do in hopes to differentiate from other idols called "10 rounds of practice, 10 minutes rest."

Debuting earlier in May, CLASS:y has been attracting attention for their extraordinary vocal skills despite just being rookies.

Earlier on June 3, the group uploaded a practice video for their new song "CLASSY" on their official YouTube channel. Unlike the typical dance practice video with full AR (All Recorded), the group's dance practice video was filmed with only the MR (Music Removed) which consists of only 10% of the backing vocals. Despite the rigorous dance routine, the girl group pulled off perfect rapping and singing in a steady tone.

According to their agency, CLASS:y only takes a 10-minute break after practicing more than 10 times, showing CLASS:y's tremendous effort in training.
​
When this practice video was released, it also drew keen attention from the online community with comments such as "This is MR that sounds just like AR," "The accompaniment is really just an accompaniment," and "Practice video of swallowing a CD."

Check out the dance practice video above and let us know what you think!