Dizzy turning, turning dizzy

It was a very interesting first Salsa lesson at the Intermediate level.
We learnt the 'prep' turn, along with 'titanic' and the 'copa'.
This time, the class consisted of 10 ladies and 3 men (including the instructor himself).
Obviously, the 2 men (minus the instructor) had plenty of practice opportunities, whereas us ladies only have 1 turn each.
At the end of the lesson, our instructor said we need to perfect our 'prep' turns by next lesson.
He said we need to practice 5 times a day, and each time, turn till we are dizzy before we can stop.
Without doing that, I'm already dizzy with work.
So how?