Chinese super heavyweight Zhou Lulu shouts ''relax'' to calm her nerves. Iran's Saeid Mohammadpour hisses like a snake.
The variety of grunts and screams that weightlifters let out before their battle with gravity isn't just for show.
It's to ''let the weights know you're coming'' in the mental buildup before a big lift, said Joe Micela, coach of U.S. weightlifter Sarah Robles.
''We call it a trigger point,'' Micela said. ''Letting out that yell, is preparing my mind and my body to go do this thing.''
The here-I-come shout is a common feature in strength sports such as hammer throw, shot put and javelin.
In weightlifting it is part of the acoustic drama that doesn't quite come through on TV, like the clang of the barbell slamming onto the platform, the suspenseful silence when a nervous lifter adjusts a grip on the bar or the roar that fills the arena when an athlete lifts three times his body weight.
''I've been to many world championships and two Olympics, but I think the en...