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The muscles around the back of the thigh known as the hamstrings are responsible for extension of the hip and flexion of the knee, making them equally essential for physical activity.

“I got a lot of body weight on my knee, had some extra flexion I haven’t known for the last 20 years,” Rodgers said.

The game tests shoulder range of motion including flexion and extension, reactive movement, core control, motor skills and tests their vision while engaging in a high stimulation environment that distracts from physical pain or fatigue.

Forget his stance, his “firing position,” his “flexion” or his “levers”: Can he SEE the ball?

The Dodgers’ manager used technical terms like “flexion,” “levers” and “barred out.”