Like a real cheetah, the robot has an articulated back that flexes back and forth with each step, increasing its stride length and running speed.
Despite a certain wariness in her gaze and upper body, her stance is excellent — her weight mostly over the slightly flexed back leg, her front foot stepping boldly forward in preparation for the swing, which will initially take the bat up and back, then swiftly down into the reversing pivot and full-body turn that precede and accompany her Speaker-esque, closed-stance cut at the ball.
In the artificial ray, the muscles only have to exert themselves downwards when stimulated; the curvature of the gold ribs in the opposite direction provides the counterforce and when the muscles relax, that part of the fin flexes back upwards.
That allows it to build a lightning plug that both flexes back and forth for easier removal, and depresses slightly, meaning you can use it with cases and bumpers as well as with a naked iPhone 5.
On the left leg, keep it out straight, with the toes flexed back.
Walk tall, with your stomach pulled towards your back, your shoulders flexed back and relaxed, and your head high.
In this grip, the hand is flexed back at the wrist, so that as you pass into the forward swing it is on top of the ball.
You need to maintain what is called the "laconic position," in which your neck is flexed back slightly, not perfectly straight so your eyes are pointed down.
Lane built its Action Flex-Back chairs to do just that and sold $35 million worth to retailers at the show.
