💪◀▶️🤏

#muscle shortening #squeezing #tightening #muscle action #concentric #physiological process #grip

⤴️💪

#muscle extension #straightening force #upward movement #muscle action #physiology

💪🪌↪️

#brachialis #elbow flexion #arm muscle #upper arm anatomy #muscle action #flexion

💪🦴➡️

#extensor muscle #muscle action #joint extension #physiology #straighten bone