Joint Actions and Sporting Movements
Ever wondered how your body creates those smooth, powerful movements in sport? It all comes down to joint actions - the specific ways your bones move at connection points.
Flexion and extension are your most basic movements. Flexion bends a joint (like curling your arm during a biceps curl), whilst extension straightens it (like your elbow when shot putting). These opposing actions work together in almost every sport.
Your ankles get special treatment with plantar flexion (pointing your toes like a ballet dancer) and dorsi flexion (pulling your toes toward your shins when lifting a football). Meanwhile, adduction brings limbs toward your body's centre, and abduction moves them away - think of jumping jacks for a perfect example.
Quick Tip: Remember that flexion = bending, extension = straightening. This simple rule applies to most joints and will save you marks in exams!
The five major joints you need to master are the hip and shoulder (both ball and socket joints), plus the knee, ankle, and elbow (all hinge joints). Each joint type determines which movements are possible - ball and socket joints offer the most freedom, whilst hinge joints work like a door, moving in just two directions.