I usually try to do some type of cardio on Sunday moring before i eat, you burn glycogen by doing so, this helps you get into ketosis faster.

Whatever can speed you entry in ketosis is worth doing, the faster your get there after your weekend carb up the faster you will start burning fat.

I guess it would be less critical when you reach ketosis, training while in ketosis is really not fun at all, this is why i try to train cardio on SUnday and gym on Monday and Tuesday doing lots of sets and reps will help you too.