Ball and socket joints also allow flexion and extension. Flexion of the shoulder joint occurs when the humerus (upper arm) moves forwards from the rest of the body, which happens at the end of an ...

In some cases, Dr. Ode says, frozen shoulder follows an injury or surgery that keeps you from moving the joint (what doctors ...

Extension – straightening a joint ... Circumduction – this is where the limb moves in a circle. This occurs at the shoulder joint during an overarm tennis serve. Rotation – this is where ...

Squeeze your core and glutes to stabilize, then raise the kettlebell into a full arm extension ... stability and injury ...