Doing that for over three hours, quite impressive.

I guess the goal here was to keep her legs shut against some resistance judging by the progression? If that's the case, very few people would have that sort of endurance under normal circumstances. Holding it partway open at the second frame would have been hardest of all.

The clock really adds to this picture.
General progression is always nice and this does it very nicely.
Love his other work, too