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The vastus medialis is involved in leg extensions.
The seated leg extension isolates the...
muscle
It has 3 joints.
They have 1,000,000 joints
Stuart Ross Norman has written: 'The influence of flexibility on velocity of leg-extension at the knee' -- subject(s): Muscles, Joints, Knee, Stretching exercises, Range of motion, Leg, Exercise
to move
Leg extension exercises focus on quadriceps.
Flexion and Extension
extension
I do believe the joint in the middle of your leg is your knee.
The four synovial joints are: Flexion, Extension, Abduction and Adduction.