Horror movie with person facsinated with filming women in distress

There was this one color horror movie, I don’t remember the date but it was at least in the 2000s and in English, that started out with the first scene of a woman tied up and forced to hold up a weight on an exercise bench. She holds it up until she can’t hold it up anymore and it falls but it doesn’t kill her and she is never seen again.

Which movie is this?

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