Workout Video Fail, See If You Can Find It!

There are thousands of instructional workout videos on YouTube. But there's only one we know of where you see someone drop weight THIS fast.
A new video from a fitness website called TheDailyHIIT.com MOSTLY shows a ridiculously in shape
It shows a woman doing some kind of crazy workout.
But at two points in the video, you can distinctly see a major OOPS! can you guess what it is? pay attention!