erector spinae, hamstrings, gastrocnemius, trapezius, quadratus lumborum
The knees is known as a hinge joint, as it can only bend in on direction when it's bent. while the knees is bending the muscles in the leg are expanding creating a wider stride, when the legs comes back the muscle contracts.
SmoothI'm POSITIVE it's the Skeletal Muscle!
Rectus abdominis.
Flexor
There are several muscles involved in bending the arm, and several others used to extend the arm. Muscles can only PULL; they cannot push or twist.
main muscle groups used for AFL
Gastrocnemius muscle
Periodic rest and relaxation for the muscles involved in repetitive action.
To raise your hand in class, by bending your arm at the elbow.
voluntary and involuntary
Calcium
Inversion is often associated with the ankle; spmetimess called supination. And there several muscles in involved. The muscle of inversion of the foot is mostly the tibilialis anterior.