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Coach Education Series Copyright © ITF 2007
Biomechanics of the forehand
stroke
ITF Coaches Education Programme
Original article: Bahamonde, R. (2001). ITF CSSR, 24, 6-8
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Coach Education Series Copyright © ITF 2007
Introduction
• The tennis forehand stroke has changed drastically over the last 10 years
• Today's players seldom use the traditional forehand but the modern topspin forehand stroke
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Coach Education Series Copyright © ITF 2007
Introduction
• Changes in the forehand technique have been attributed to: – New racket designs, – Better physical fitness of the players, and – Increasing speed of the game
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Changes in racket designs
• Rackets are bigger, lighter, and stiffer than the traditional wooden rackets
• Allow players to hit the ball with: – More power and – More control
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Changes in racket designs
• These changes in the forehand technique have influenced: – The type of grip, – Footwork, and – Racket backswing and forward swing
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PreparationThe Grip
• Functions of the grip: – Provide the proper racket orientation at impact, – Place the wrist in a favorable strength position,
and, – Allow for hand mobility
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PreparationThe Grip
• Use a firm grip near impact to control the racket during off-centre hits
• Most tennis professionals advocate the use of a western or semi-western grip instead of the traditional eastern forehand grip
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PreparationThe Grip
• Western: – Easier to generate topspin and maintain racket
orientation at impact– Produce higher forward (toward the court) and
sideways (along baseline) velocities than the Eastern
– Difficult for players to hit low bouncing balls.
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PreparationThe Grip
• Eastern forehand:– Greater wrist stability – Proper racket orientation at impact regardless of
ball height
• Semi-Western forehand
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PreparationThe stance
• Open stance: – Players must react faster and are forced to hit on
the run due to the power developed in the groundstrokes and the serves
– Little or no transfer of linear momentum since the step is taken side ways,
– Only the segment rotations are used to generate power for the forward swing
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PreparationThe stance
• Traditional square stance:– Takes longer to execute – It generates linear momentum; as the player steps
forward toward the ball, and– Angular momentum; from the rotation of the legs,
hips, and trunk
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The backswingWhich type provides more racket
velocity and control?
• Traditional straight: – Thought that provided more control– Loop (large and small) backswings provided
greater racket velocity
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The backswingWhich type provides more racket
velocity and control?
• Large-loop: – Increases racket velocity, but affects racket control
and timing
• Small-loop: – Increases racket velocity without affecting the
timing and control of the stroke
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The backswingWhich type provides more racket
velocity and control?• Regardless of the type of backswing used
• For more power and efficiency
• Transition between the backswing and forward swing: – Fluid motion: smooth and continuous – Enhances the player's ability to utilize the pre-stretching of
the muscles
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The forward swingType
• Modified by the changes in the game
• Multi-segment forehand technique: – Used by top professional players – Individual segments of the upper extremity are
used to generate racket velocity– More compact arm during the backswing– Generate higher racket and ball velocities
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The forward swingType
• Conventional / single unit forward swing: – Segments of the upper extremity move as a single
unit from the shoulder– No differences in the grip or initial footwork
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Coach Education Series Copyright © ITF 2007
The forward swingType
• Select the forward swing: – Multi-segment or – single unit forehand
that best suits the player’s physical and motor skill abilities
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The forward swingRacket trajectory and orientation
• The trajectory of the racket (stroke arc): – Horizontal motion: flattened arc near impact– Vertical plane: Optimum angle of the racket 28o
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The forward swingRacket trajectory and orientation
• Angles: – Smaller tend to produce less spin – Larger sacrifice ball speed and the depth– Changes in footwork and forward swing influence
the arc
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Coach Education Series Copyright © ITF 2007
The forward swingRacket trajectory and orientation
• Multi-segment forehand swing: – Smaller arc= smaller swing radius= less accurate – Steep vertical trajectory at impact (47o)
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The forward swingRacket trajectory and orientation
• Open stance: – Not more efficient – Result of lack of preparation time for the forehand
stroke– Less time to successfully hit the ball on the racket
face in the horizontal plane.
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The forward swingRacket trajectory and orientation
• Closed stance: – More accurate racket path in the horizontal plane.
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The forward swingLinear and Angular Momentum
• How to develop more power and control? • Both can be achieved through the proper
development of linear and angular momentum
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The forward swingLinear and Angular Momentum
• Linear momentum: – Quantity of linear motion that a body possesses– Developed through the forces generated from the
ground as you step forward and transfer your body weight from the back leg to the forward leg (for a closed stance footwork)
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Coach Education Series Copyright © ITF 2007
The forward swingLinear and Angular Momentum
• Angular momentum:– Quantity of angular motion that a body possesses– Developed from the ground reaction forces (GRF) – Tends to produce a sequence of body rotations
(legs, hips, trunk, upper limb, and racket)– Optimal trunk rotation is one of the outcomes of
angular momentum
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The forward swingLinear and Angular Momentum
• Trunk rotation: – Correlated with racket velocity (about 10%) – Used in the pre-stretching of the shoulder muscles
to allow them to produce a larger tension
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ConclusionWhat to do to produce explosive
forehands?• Understand the basic biomechanical
principles • Understand how to apply them to the different
components of the strokes
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ConclusionWhat to do to produce explosive
forehands?• The racket is one of the most important
sources of power for a tennis player• Stress the importance of using trunk rotation
and the legs throughout the forehand stroke • Explain to the players the importance of a
proper follow-through.