Institute of Nutrition and Fitness Sciences - Flexion vs Extension: Flexion refers bending and extension refers stretching. Flexion - bending movement reducing angle between the body parts. Example, Bending elbow, curling leg
Leg Muscle Stretches: Knee Flexion | Saint Luke's Health System
Muscles That Move the Leg
Age-Related Differences in Motor Coordination during Simultaneous Leg Flexion and Finger Extension: Influence of Temporal Pressure | PLOS ONE