So I know this is a dumb question, but I'm curious as to know what those things are and their use. I thought they were styrafoam but they are hard and a little heavy. They have them by the mats and exercise balls.

I feel silly asking anyone at the gym since I haven't seen anyone actually use one!

They're foam rollers and used for self myofascial release ... a kind of self massage for knotted and tight muscles.

Self-massage -ohh, sounds nice Maybe I can get one of the trainers to show me how to use it!

THANKS, MEG!