When you are at work or even when you are giving of your free time to anything you deem worth while, but more so at work if you didn’t sweat at least a little bit during your shift you didn’t work hard enough. I understand that some people work in office settings and normally don’t sweat unless the HVAC is busted (air conditioner), but step up your tempo for a part of each day and challenge yourself to get more done.
If anything this will help prevent a backlog of work from occurring. It also shows some initiative on your part to bring your “A game”. I promise your boss/manager/supervisor will notice this. At the minimum when it comes to review and raise time guess who is going to get the excellent rating and a pay bump. Hell, you might even get a promotion out of it.