It'll take zero ounces of blood, sweat, or tears. And, you don't even have to move to do it.
The next person you see, whether it's the little old man you're passing on your way to your car, or the cashier checking you out at Walgreen's, or even the unknown lady hollering about "the rats!!" outside your window (maybe that's just a New York problem, but I digress), think,
"I wish for you to be happy."
When I practice that bit of Buddhist loving-kindness I can feel the back of my neck relax (which I didn't even realize I was clenching), my forehead smooth, and my shoulders move away from my earlobes.
All thanks to a random tip from one Chade-Meng Tan, long-time meditator and Google software engineer, found in my new bedtime book, Tim Ferriss' Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers .