The racquet (in right hand) is swung upward where it makes contact with the ball out in front (contact point: where the ball begins to drop after being tossed), which results in full extension of the right arm. Simultaneously, the body is rotated to face the net, the left arm is immediately brought down after tossing the ball, and the left foot is stepped out towards the net (but not touching the baseline). As a result, the left knee is flexed with the right knee remaining in extension. During the entire phase, the body weight is transferred forward.
Shoulder Girdle:
Right shoulder girdle undergoes upward rotation with concentric contraction of middle and lower fibers of trapezius and serratus anterior.
Left shoulder girdle goes through downward rotation with concentric contraction rhomboids and pectoralis minor.
Left shoulder girdle goes through downward rotation with concentric contraction rhomboids and pectoralis minor.
Shoulder Joint:
Right shoulder joint is abducted with concentric contraction of supraspinatus, deltoid, and upper fibers of pectoralis major.
Left shoulder joint is adducted with concentric contraction of latissimus dorsi, teres major, and lower fibers of pectoralis major.
Left shoulder joint is adducted with concentric contraction of latissimus dorsi, teres major, and lower fibers of pectoralis major.
Elbow Joint:
Right elbow joint is extended with concentric contraction of triceps brachii and aconeus.
Left elbow joint remains in extension with isometric contraction of triceps brachii and aconeus.
Hip Joint:
Right hip is extended with concentric contraction of adductor magnus, semitendinosus, semimembranosus, biceps femoris, and gluteus maximus.
Left hip is abducted with concentric contraction of sartorius, gluteus medius, gluteus minimus, and tensor fasciae latae. This is then followed by flexion through concentric contraction of iliacus, psoas major and minor, rectus femoris, sartorius, pectineus, gluteus minimus, and tensor fasciae latae.
Knee Joint:
Right knees remains in full extension with isometric contraction of rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis.
Left knee is flexed through concentric contraction of biceps femoris, popliteus, semimembranosus, and semitendinosus.
Left elbow joint remains in extension with isometric contraction of triceps brachii and aconeus.
Hip Joint:
Right hip is extended with concentric contraction of adductor magnus, semitendinosus, semimembranosus, biceps femoris, and gluteus maximus.
Left hip is abducted with concentric contraction of sartorius, gluteus medius, gluteus minimus, and tensor fasciae latae. This is then followed by flexion through concentric contraction of iliacus, psoas major and minor, rectus femoris, sartorius, pectineus, gluteus minimus, and tensor fasciae latae.
Knee Joint:
Right knees remains in full extension with isometric contraction of rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis.
Left knee is flexed through concentric contraction of biceps femoris, popliteus, semimembranosus, and semitendinosus.
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