The core strength training (CST) plays an important role
in reducing and preventing lower and knee joint injuries
. In recent years, core strength training is widely
used in improving performance
reducing the risk of injuries in athletes, increasing physical fitness in healthy individuals , and rehabilitation of patients with a low back pain . Weak trunk extensor muscles may be a risk
factor for low back pain . The core has
been described as a muscular corset with the abdominals in
the front, erector spinae and gluteals in the back, the
diaphragm as the roof, and the pelvic floor and hip girdle
musculature in the bottom . The
core muscles stabilize the spine and trunk during movements
of lower and upper extremities such as jumping,
running, and throwing. Previous studies revealed that trunk
muscle fatigue led to decreased dynamic stability of the
trunk and loss of balance control
suggested that knee pain affected trunk
and knee motions during forehand lunges, and training
programs for badminton players with knee pain should
include core strength exercises