Scott’s mentioned it a few times on some of the older shows as a decent replacement for weights. It’s especially helpful for people who are travelling, because there are grocery stores everywhere, and canned fruits or vegetables are really cheap. (Especially compared to weights.)
I don’t usually go to the gym, but once when I did I took a core training class. We all took weights: I took ones that were approximately 3 pounds, and it tell you, it was too heavy! I felt like my arms were falling off! It’s amazing how much stuff you can do with really light weights.
Cheers,
Julie