A little understood aspect of CPR is that is it actually surprisingly physically demanding. Most people quit because they get tired before too long. Someone like Tess would quit almost immediately because she would herself be out of breath and probably need resuscitation. Although I remember one story from one of my classes about a 90 year-old woman who gave CPR to her husband for hours and hours and hours because there was no one around to hear her cries and she had to wait for someone to drop-in to help and call the ambulance. You know she wasn't fat. Something, something, the power of love.