very good - similar to when you walk onto a static escalator and even though you can see it isn't moving your body involuntary assumes it is and makes adjustments to allow for the assumed movement.
I did this with my children the other day - 2 year old; no effect. 8 year old; felt a little odd. 12 year old; reacted the same as me and nearly fell over.
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I did this with my children the other day - 2 year old; no effect. 8 year old; felt a little odd. 12 year old; reacted the same as me and nearly fell over.