Exercise - Knee Extension on Gym Ball
Correct
![](https://www.vissco.com/wp-content/uploads/animation/sub/knee-extension-on-gym-ball.gif)
Wrong
![](https://vscomfortimages.s3.ap-south-1.amazonaws.com/wrongform/untitled-1549.jpg)
Do not arch the back, lean forward/backward or sideways or rotate the leg
DIRECTIONS
Position : Sit
Sit on the gym ball, arms elevate to 90 degrees by the side and hips-knees angle is 90-90 degrees.