This clip is taken from a Pepsi Max commercial (see below). This clip has been restored to 24 fps, so there is no sound (because fixing that is too hard). In the original, the camera is actually moving while Walters is running the loop, which may be very artsy and all, but is useless for motion analysis. To compensate, I've shifted the clip, frame by frame, to keep it in the same place on the screen. The result is not perfect (the loop appears to twist as Walters runs it) but it is good enough. The inner diameter of the loop is exactly 10 feet.

I show the full three minute commercial to my students as the "hook" when introducing circular motion. The original seems to be no longer available in Pepsi's YouTube channel, but others have posted copies. One of these is linked below. If that link breaks, try a Google search for "walters loop pepsi" and you will likely find a copy. If all else fails, I know someone who might have saved a copy on a hard drive somewhere...

In the full video, there is a conversation with a physics consultant who explains that Walters needs to be running at 8.65 mph to make it around the loop. (This was how I determined the loop diameter.) I challenge my students students to see if she was right, and if not, whether the speed they do find is reasonable.