🎾 The Principle Of Balance¶
Giới Thiệu¶
The Principle Of Balance — tài liệu 4 trang từ thư viện sách tennis.
Chủ đề chính: Thăng bằng, Biomechanic, Cơ sinh học, Roger Federer, Coach, Thể lực
Tóm tắt nội dung (trích từ tài liệu gốc): Tennis Biomechanics - 3: The principle of "balance" Author: Cyril is a tennis coach This article presents the biome- Initial Lateral steps and physical conditioning ex- pert with over 25 years' expe- chanics principle of "balance" Figures 1 and 2 highlight how rience in the tennis coaching and its application in tennis. Roger Federer maintains an and sport sciences field. He is a Balance is defined as the ability upright position of the head qualified "Tennis Professor Lev- to manage body position, either and upper body with the lines el 2", the highest tennis coach- statically or dynamically,
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Nội Dung Gốc (Tiếng Anh)¶
Tennis Biomechanics - 3: The principle of "balance"
Author: Cyril is a tennis coach This article presents the biome- Initial Lateral steps
and physical conditioning ex-
pert with over 25 years' expe- chanics principle of "balance" Figures 1 and 2 highlight how
rience in the tennis coaching and its application in tennis. Roger Federer maintains an
and sport sciences field. He is a Balance is defined as the ability upright position of the head
qualified "Tennis Professor Lev- to manage body position, either and upper body with the lines
el 2", the highest tennis coach- statically or dynamically, in re- of his eyes and his shoulders in
ing qualification in France and lation to one's base of support. horizontal position. In ready
has a Master's degree and PhD Dynamic balance is involved in position (figures 1A and 2C),
in Sport Sciences. Cyril�s back- every steps, stops, stances, and his feet are more than shoulder
ground also includes presenting moves. Faster is the game, high- width apart with bent knees to
at various national and interna- er are the demands in dynamic lower his center of gravity.
tional conferences including the balance.
2015 ITF Worldwide Coaches Balance strategies during
Conference by BNP Paribas. What are the factors affect- the groundstrokes:
He has also contributed publi- Players use different actions of
cations in internationally peer ing balance? the feet and body to maintain
reviewed scientific journals, the dynamic balance when hitting
ITF Coaching and Sport Sci- � Size of the base of sup- the ball. They vary with the
ence Review and for the French phase of the shot, the stance, the
Tennis Federation. port in the direction of force court position, the incoming
ball's characteristics and their
(neutral stance more stable than tactical intent.
open stance for example) Preparation phase
Figure 3 shows players at the
� Height of the center of end of the preparation phase
of a forehand shot with a base
gravity above the base of sup- of support larger than shoul-
der width apart both in neutral
port (Figure 3A) and open stance
(Figure 3B). The non-dominant
� Location of the center arm is positioned at the same
height than the dominant arm
of gravity projection within the and in the same plane.
base of support
� Mass of the body
� Friction related to the
court surface (more stability on
hard court than on clay court)
Practical coaching keys to
improve balance
� Increasing the size of the
base of support
� Lowering the center of
gravity
� Keeping an upright po-
sition of head and upper body
� Using the non-domi-
nant arm and leg to counteract
the hip and shoulder rotations
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Figure 1: First lateral step to the ball
Figure 2: First lateral recovery step
Figure 3
Figure 4 shows players at the
end of the preparation phase
of a one-handed (figure 4A)
and two-handed (figure 4B)
backhand shot with a base of
support larger than shoulder
width apart
Figure 4
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Acceleration phase Figure 5
During the acceleration phase Figure 6 shows players hit-
of groundstrokes, players use ting a forehand with an open
dynamic actions of non-dom- stance under (figure 6A) and
inant side limbs to maintain over (figure 6B) waist level.
their balance depending on the The players elevate the front
stance used. leg and fix the non-dominant
arm to counter the trunk ro-
Figure 5 shows a player hitting tation.
a forehand with a neutral stance
at knee (figure 5A) and waist
(figure 5B) level. The player uses
the back leg differently for bal-
ance depending on the height
of the contact point. When the
ball is low, the player drops the
back knee down keeping it bent
and close to the court. When
the contact point is higher the
player kicks the back leg back
and up. The non-dominant arm
is fixed to control the trunk ro-
tation.
Figure 6 For subscription : ask@tennistoday.in
38 | November 2017
Balance strategies during Figure 7
the serve:
The foot technique affects the size of
the base of support and thus the de-
gree of stability (figure 7). Coaches
have to monitor the balance ability
of their players when asking them to
perform a foot-up technique. From
a development player point a view,
the foot-back technique should be
the first to be taught. Independently
of the stance, the full non-dominant
arm extension helps to stabilise the
non-dominant side before initiating
the leg drive.
During the acceleration and fol-
low-through phases, players use their forehand (figure 9A) and backhand ercices aiming at improve the ability
of the player to be well-balanced.
non-dominant side to maintain dy- (figure 9B) volley. The exercises can be oriented both
on technical and physical compo-
namic balance: Conclusion: nents depending on the player's
� A full non-dominant arm ex- The "balance" principle is present in needs.
every tennis movement and shot pro-
tension allows vertical stabilization of duction. Coaches should focus on ex-
non-dominant side (figure 8A).
� The non-dominant arm helps
to block the upper body from exces-
sive transverse rotation (Figure 8B)
� The Arabesc with the back
leg combined with the backward ex-
tension of the non-dominant arm
helps to counterbalance the forward
flexion of the trunk at landing (figure
8C).
Balance strategies during
the volley:
Figure 9 shows how the player uses the
non-dominant arm and the non-sup-
porting leg to maintain balance during Figure 9
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