sentence: A woman demonstrates posture and exercise technique while sitting on a floor in work out clothes. sentence:  A woman in work out clothes is sitting on the floor and talking to the camera when she suddenly turns to the side, still talking to the camera but pointing now to her shoulders and waist. sentence:   The woman begins to mimic the motion of typing with her fingers and eventually begins to demonstrate sit ups. sentence:   The woman turns on her side and then lays down on the floor while motioning to her stomach and still talking to the camera.