The first half of the shake will help stave off some catabolism, but it still does not contain many calories (less than 200 probably). This is more trouble, but I prefer to eat oatmeal and some whey about an hour before workout, that will stick with you a little better and should improve the quality of your workouts. Yes, bananas will work in the post workout shake (atleast 2 of 'em). You could also just have a shake with more calories pre-workout (it will help get your blood flowing too). Maybe something like 75 g's of carbs and 40 g's of protein. Let me know what you think.