Instead, stick to the standard dumbbell skullcrusher. Tuck your elbows in tight to the sides of your body, and get into ...

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 ...

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 ...