Joints can handle some heavy pressure. For example, knees have to handle a force of three to four times a person’s total body weight on average when just talking a walk. The force of a deep knee bend during a squat can increase to nine times the body’s weight. So just imagine multiplying weight of more than 150 pounds times a minimum of three or four, and then even more. That can add up to a lot of heavy work on knee joints over a period of time.

Now for the science behind this scenario. The place where two bones meet is called the joint- the bone ends are covered with cartilage, also known as gristle.

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