Charlie drives the penetrometer into the soil and, leaning down on it as it descends, he falls forward to the ground. It takes three attempts for him to get back up by doing press-ups to a kneeling position before standing. In the middle of his second press-up, he supports his whole body on his hands, completely off the ground for two seconds. The strip of white soil in the background is the South Ray Crater ejecta blanket.
Source: http://www.hq.nasa.gov/alsj/a16/video16.html
