Functions and Movement of the Elbow Muscles
The biceps are a 2 joint muscle – shoulder and elbow joints; it is weak in any actions at the shoulder joint and is the most powerful flexor of the elbow joint. Flexion of the forearm, known as ‘curling’ with a barbell in the hands is an excellent exercise to develop the bicep brachii.
The brachialis is used along with other flexor muscles , whether in pronation or supination. It pulls on the ulna, which does not rotate, thus making this muscle the only pure flexor of this joint.
Typical action of the triceps is shown in press-ups when there is powerful extention of the elbow. It is used in any pushing movements. Pressing a barbell upward with weights is an excellent exercise to develop this muscle