Lead by example!! I speak to my team members daily about it. I play Knock out trivia 2 to 3 times a day. All work and no play makes for a dull individual as the saying goes. Playing games also is a means to stimulate competitiveness which is crucial to business success. This is what you should explain to them. Mind games like Knock Out Trivia will show you areas in which you may need to expand your horizons.