Found some Australian "Can Science Take The Weight Off?" commercials with a woman getting thinner and fatter offscreen. 30 secs: /watch?v=1K9e2LvkTjY 15 secs: /watch?v=1K9e2LvkTjY

http://youtube.com/watch?v=1K9e2LvkTjY

I think these are the same link!  Unfortunately, it doesn’t work.  Second up:

15s:  https://www.youtube.com/watch?v=lW8WeyKugWg

30s: https://www.youtube.com/watch?v=yTR3doRVHms

A woman’s running behind objects and scenes wherein she weighs less from one side than the other.  Thank you, Anon!