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Flexion is a bending movement that decreases the angle between two joints. Bending the elbow joint, or performing a sit-up are examples of flexion. When sitting down, the knees are flexed. Flexion of the hip or shoulder moves the limb forward (towards the anterior side of the body). Flexion is the opposite of extension. 
- ↑ Donche, Dan (2008). FF Trainer Certification Guide. USA: Fatal Fitness.