What Creature Has 1 Head, 6 Arms And 2 legs?
Other than keeping hands to the respective sides, there is no restriction on the positions. For example, the dancer in the middle could have her left hand in the down position, and her right hand in the up position.
How many ways can 3 dancers recreate this dance illusion?
Image credit: Wikipedia
If you want another problem on multi-limbs, check out The Math Behind The Perfect Man.