When was the last time you took a whole hour for lunch—and actually left your desk? A survey from CareerBuilder reports that workers these days take an average lunch break of 20 to 40 minutes, and 18 percent of employees stay in their cubicle, office, or workspace to eat.

What should they do instead to feel fresh and productive the rest of the day? Try these activities:

• Take a walk outside

• Talk to a friend

• Take a quick nap

• Do some stretching exercises

• Play a quick, mentally challenging game