Exercising at least 150 minutes a week can help you sleep better and feel more alert during the day, which will up your productivity and help you impress your boss at meetings. In fact, getting in a midday workout has the net effect of boosting your productivity in the afternoon–even though you’re spending less time at the office overall. It increases your creativity right afterward and decreases sleepiness. And you’ll need to take fewer of your sick days if you exercise regularly.