Answer:
A) weak muscles
Explanation:
Joint range of motion refers to both the distance a joint can move and the direction in which it can move. There are established ranges that doctors consider normal for various joints in the body.
For example, one studyTrusted Source determined a normal knee should ideally be able to flex, or bend, to between 133 and 153 degrees. And a normal knee should also be able to extend so that it’s completely straight.
A reduction in a normal range of motion in any of the joints is known as limited range of motion. Joint range of motion naturally declines as you age, but it can also occur with a number of conditions.
Certain exercises may be helpful for improving and maintaining flexibility in the joints.
