Biggest Loser

I have a fit ball in my living room, which is possibly the most popular item in my house.  One Saturday morning, I had this conversation with a 7-yr-old - possibly the longest sentence I'd heard him say.

Boy: Um, Anna?
Me: Yes?
Boy: Were you on The Biggest Loser?
Me: Ah... no... [????? What are you saying??? - oh wait, it's a Biggest Loser brand fit ball] NO - I mean, no.  I bought that at a supermarket.  I had a choice of that one or some girly pink thing.
Boy: [Doesn't look convinced.  Thanks a lot, kid]