The action of bending a joint or limb, or the condition of being bent.
From Latin 'flexio' meaning 'a bending,' derived from 'flectere' (to bend); commonly used in anatomy and medicine.
In anatomy, 'flexion' and 'extension' are opposites describing arm and leg movements—flexion brings your limbs toward your body while extension pushes them away, and every exercise you do involves both!
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