Hi, Tammy...
Just to piggyback a little bit on the great answers already, do yourself a favor, if you haven't already done so, and read the "About Cathe" section on cathe.com, it was the first thing I did when I was wanting to commit to a new fitness leader, to say I was impressed would be an understatement, I knew I'd be in good hands with her, and my results have been numerous...from seeing some definition in places I never knew I had places, to having less body aches and more flexibility in my lower back.
One of the reasons I left the gym was the lack of knowledge with some of the employees...someone once asked a gym employee how to use a paticular machine, and the response was..."I don't know, I just work here"....why would a place hire someone like that, or at least have their employees go through training.
I know people have gotten and will continue to get good results with gyms, but I'm very confident in saying by working out at home exclusively, you can get into great shape both mentally and physically, I know from experience.