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The make-up of the human skeleton is a fantastic display of evolution that has left us with the ability to perform incredibly complex tasks without even thinking about them. There are several different types of joints between bones in your body, which reflect their functions – some are strong and allow little movement, while others are weak but allow free movement. The forearm and lower leg have two bones that form plane joints at the wrist and ankle. This type of joint allows for a range of fine movements, including gliding and rotation. The hinge joints at your elbows and knees allow for less lateral (sideways) movement, but they are very strong. The shoulders and hips, meanwhile, are ball-andsocket joints, which allow for a wide, if not overly refined, range of motion.