Then it happens

As soon as Fanny said that everybody starts laughing around her.

It takes her a moment to realise but then she looks down and she is completely naked in front of everybody. She doesn't know how this happened. But she immediately holds her hands in front of her pussy and small boobs.

Sophie: All get back in line and start doing the exercise again. Or you will get the same punishment Fanny just had.

Everybody stops laughing immediately and the gym is completely quiet.

Once it is Fanny her turn again she actually stands still for a while and thinks how she should do this.

She just starts running and forgets about covering up. Then she just over the buck flawlessly and lands on the the matress. Once she has landed she immediately covers up again and walks back towards the line slowly.