Preparation

General Terminology

• Shoulders and hips turn/rotate to the left
• Racquet goes back and to the left in the motion of a small letter C so eventually the right arm is straight and the left arm is slightly bent - the racquet face is now behind you and somewhere between the left hip and knee with both elbows close to the body; the top of the racquet is pointing almost straight behind you
• Both knees are still slightly bent

Shoulder Girdle

• Right shoulder is in abduction with the pectoralis minor and serratus anterior contracting eccentrically
• Right shoulder is also in downward rotation with the pectoralis minor and rhomboids contracting concentrically
• Left shoulder is adducting with the middle and lower trapezius and rhomboid contracting concentrically

Shoulder Joint

• The right shoulder joint is internally rotating with the latissimus dorsi, teres major, pectoralis major, and subscapularis contracting concentrically
• The right shoulder joint is also adducting with the latissimus dorsi, teres major, and lower pectoralis major contracting concentrically
• The left shoulder joint is externally rotating with the infraspinatus and teres minor contracting eccentrically  

Elbow Joint

• Initially the left elbow starts out slightly flexing more than it already is with the biceps brachii, brachialis, and brachioradialis contracting concentrically  
• During the second half of the preparation the left elbow begins to slightly extend with the triceps brachii and anconeus contract eccentrically 
• The right elbow joint is extending with the triceps brachii and anconeus contracting eccentrically

Radioulnar Joint

• The left radioulnar joint is initially pronating with the pronator teres and pronator quadratus contracting concentrically 
• In the second half of the preparation phase the left radioulnar joint is moving from pronation to supination with the biceps brachii and supinator contracting concentrically
• The right radioulnar joint is pronating with the pronator teres and pronator quadratus contracting concentrically 

Wrist and Hand Joint Movements

• The right hand has flexion of the fingers and thumb with the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus contracting concentrically
• The right wrist is in neutral position contracting isometrically
• The left hand has flexion of the the fingers and thumb with the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus contracting concentrically
• The left wrist is slightly extending with the extensor carpi ulnaris, extensor carpi radialis brevis, and extensor carpi radialis longus contracting eccentrically