I read on Cathes page where to get in shape for the new vids she did one body pump class per day and then worked one body part per day doing weights. I am not familiar with this terminology. Can someone please explain? I am assuming a body pump class is like doing one of her videos with maybe faster moves and lighter weights but what is one body part per day? Do you work only arms one day, legs the next, shoulders the next or does she mean upper body one day, lower the next and so on? For how long do you work them? thanks, kitty