This is how the video’s poster describes what’s going on in the footage**:
Курсанты с военной кафедры. Первые тренировки марша с песней.
Funny, right? The second line is particularly revealing.
Just kidding. Here’s the English translation, via Google Translate:
The cadets from the military department. The first workout of the march with the song .
Believe that says it all.
**”Barbie Girl” is a song by Danish-Norwegian dance-pop group “Aqua”. It was hugely popular when Clinton was president.