求翻译：　　俯卧在健身球上，前臂撑在地面上，两手的手指相接，球撑在身体中心。腿部向上抬，与地面呈45度角，使身体呈一条直线。是什么意思？

Prone on the ball, the forearm support on the ground, connecting the fingers of both hands, the ball stays in the center of the body. Leg lift up a 45 degree angle with the ground, the body was a straight line.

Prostration, forearm on shoring in the fitness ball on the surface of the ground, and two hands, and the ball back in his fingers shoring centers in the body. legs upwards from the ground up to 45 degrees, and the body is a straight line.

　　Lies face downwards on the fitness ball, the first arm rest in the ground, two finger docking, the ball supports in the bodily center.The leg department lifts upwardly, delivers in person 45 degrees angles with the place, causes the body to assume a straight line.

　　Prone position on the fitness ball, forearm support on the ground, his hands finger touches the ball support center of the body. Leg lift, and the ground at a 45 degree angle, the body is a straight line.

　　Prone position on the fitness ball, forearm support on the ground, his hands finger touches the ball support center of the body. Leg lift, and the ground at a 45 degree angle, the body is a straight line.