^^ Agreed. Any time I'm cutting or on a diet, it's tough to lift weights, play my best tennis, etc.
One thing that helps me is to save most of my calories untill 1-3 hours prior to tennis/workout. Today by around 6pm I'll have only eaten around 900 calories. I'll eat an additonal 900-1100 between 6pm and 8pm. After I put the kids down I'll workout around 9pm.