a couple of facts:
- it takes 3500 calories to burn one lb of fat
- when you work out you retain a bit more water

So, working out will help you feel better, up your metabolism so you would lose more weight in the long run. In order to see results daily, you need to be in very good shape to be able to burn 800 calories in a workout session.. now, if you want to "tone up" you will need to do exercise with weights or machines to give your muscles some resistance...