Girl doing 10kg quarter squats wearing those wobble board trainers (http://www.play.com/Sports-Outdoors/...5|prd:34465205). Then lunges on Bosu ball, plus trainers.
Searching for the image I found this: http://www.dailymail.co.uk/health/ar...arthritis.html Yet another thing useful for rehab of the seriously injured or elderly, and marketed to fricking women. It's absurd.