Core stabilization exercise training will be given to the control group for 12 weeks, 7 days a week, for 60 minutes. Core stabilization exercises will be applied to this group under the supervision of a physiotherapist for 2 days in our unit, while home-based core stabilization exercise training will be given on other days of the week.

After the first evaluation, the training group will be given Schroth exercise training for 12 weeks, 7 days a week, for 60 minutes. This group will be given Schroth exercises under the supervision of a physiotherapist for 2 days in our unit, while home-based Schroth exercise training will be given on other days of the week.

Core stabilization training; exercises for 2 muscle systems that contribute to spinal stability are given. The first one is the "local system" muscles; multifidus, transversus abdominis, diaphragm and pelvic floor muscles. The second, the "global system" includes large superficial muscles, such as erector spines, rectus abdominis, internal and external obliques, quadratus lumborum, gluteus ma

In order to examine the muscle strength of the patients and the effectiveness of the treatment, the muscle strength of the individuals will be evaluated with the Biodex System 3-Pro (Biodex Medical Systems, Inc, New York, USA) isokinetic dynamometer device. The Biodex isokinetic dynamometer device adapts at a constant speed, allowing a dynamic test that can give resistance. The adaptiveness of the resistance and the ability to give the same resistance throughout the entire range of motion provide maximum muscle strength. In addition to this situation, the performance of the muscles can be evaluated at different angular velocities. Muscle function and muscle strength can be determined during maximum muscle contraction by using a linear scale with isokinetic dynamometer, which is an objective assessment, and with this method, information about the strength of the upper and lower extremities and trunk muscles can be obtained.

Shear Wave Elastography, also known as dynamic elastography, is a sonoelastography examination that has been developed and rapidly developed in recent years, and it provides additional information about tissue properties by evaluating tissue flexibility that can contribute to the diagnosis. In this technique application, a short-term, high-power acoustic repulsive radiation force is applied to the tissue with ultrasound probes. This force causes small displacements in tissues. These displacements in the horizontal plane are called "shear waves" and the rate of progression of these waves in the tissue can be measured. The shear wave velocity is directly proportional to the hardness of the tissue. The velocity values obtained show the objective elasticity values. Patients' spinal and abdominal muscle stiffness will be evaluated with the Toshiba Aplio 500 (Toshiba Medical Systems Corporation, Japan).

Respiratory muscle strength will be measured with a portable, electronic intraoral pressure measuring device (MicroRPM, Micro Medical; UK). Pressures will be assessed by measurements of maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP) during a few seconds of maximal inspiration (Müller maneuver) and expiration (Valsalva maneuver) by mouth.