If we got discouraged by the slow weight loss, we were shown 2 packs of lard = roughly 1lb - which really demonstrated how much was going each week. There were sessions where we swapped low cal recipes. And on a lovely sunny day we all went down to the beach to exercise. I don't think I could follow any sort of diet, but this way we gradually loss weight and have a lot of fun.
It really did not matter that we were older, and had various medical problems, as the exercises were adapted to suit us all. I think all of us have dropped at least a dress size, as well as making new friends along the way.