Stressing about that big board meeting next week? Or an upcoming pitch? Or keynote speech? Or job interview? Or NFL Draft Day? Okay, take a deep breath, boss. Then pose like Wonder Woman for two minutes.

Seriously. After all, as social psychologist Amy Cuddy demonstrates in a recent TED talk, body language doesn’t just affect how others see us, but also how we see ourselves.

In fact, standing in a posture of confidence, where you make yourself big, has proven to increase testosterone levels, while decreasing cortisol (“stress”) levels—whereas making yourself small has the reverse effect, decreasing testosterone levels and increasing cortisol levels.

The moral of the story?

Don’t fake it until you make it. Fake it until you become it.

So, what do you have to lose? (Besides your job.) Test it out before your next pressure-cooker presentation. Just sneak into the office supply closet and strike one of these power-inducing poses for 120 seconds…

While avoiding these power-reducing poses…