slow motion to flow

Yesterday after coming out of gym, I saw a group of people dressed in white, doing a rythmic movement of of bending to the left and crossing the right leg from behind ..switching back and forth this way and then lifting the right leg up into the air and just turning over. I would not have noticed it so much if I did not recognise what this conccerted movemets so slow in practice become like an unstoppable flow of movements when done to the music of hand-dealt drums. What was going on was a practice session of African dance which was done at a new student orientation at the college.