The application will be made with the patient in the prone position. By applying a few grams of constant force to the lumbar paravertebral muscles bilaterally with the hand of the physiotherapist in the direction of restriction for 3-5 minutes, the fascia will be stretched and allow the tissue to relax on its own. Thus, it is aimed to decrease the tone and stiffness of the paravertebral muscles.

During the application, the participants will be positioned standing and facing backwards due to the ease of application. While taping the lumbar region, the kinesiology tape cut as a long strip (I tape) will be applied paravertebrally to the right and left sides of the spine. Rounded corners will be created to prevent premature loosening and unwanted bends in the belt. The patient will be asked to perform maximum trunk flexion and 2 I-shaped pieces will be taped with 10-15% tension from the lumbar region to the thoracic region. The tape will remain on the patient's skin for 30 minutes.

No intervention.

Myofascial release is a manual release technique that increases the elasticity and glide between soft tissue layers, reduces this increased muscle activity and pain intensity. Myofascial release is usually characterized by prolonged mechanical forces exerted directly or indirectly on the limited fascial layers with low load. Following the direction of the fascial restraint, the therapist's hands slowly maintain the stretch and allow the fascia to relax on its own.

Kinesio Taping is a non-invasive, painless and less time consuming method with fewer side effects. It is an elastic-cotton adhesive tape that is latex-free and can be used on any joint or muscle. It can stretch significantly (130-140% of its original length), which reduces mechanical movement limitations and mimics skin in thickness and elasticity. It is used in the treatment of LBP to reduce muscle tone and stiffness as a rehabilitative taping technique designed to support the body's natural healing process.

Muscle tone and stiffness will be evaluated with a myotonometer. The myotonusometer was developed for the objective measurement of mechanical muscle properties. Myotonusometry reflects the viscoelastic properties of the muscle such as tone and stiffness by creating oscillation in the muscle fiber and is an acceptable and reliable method for measuring the mechanical properties of the muscle in young adults with chronic LBP. The device measures muscle tone as the natural oscillation frequency (Hz) calculated as Hz = 1/T; where T is the oscillation time measured in seconds. Muscle stiffness (N/m) is related to the maximum acceleration of oscillation and tissue deformation recorded by the transducer.

The Visual Analog Scale is a simple, precise and reproducible tool that is often used to assess pain severity. Due to its easy application, it is one of the most frequently used measurement tools to measure the severity of pain in low back pain. It consists of a horizontal or vertical line ten cm long. The starting point of the line, '0', represents no pain, and the ending point, '10', represents the most severe pain imaginable. Pain intensity increases as you go from 0 to 10. The patient is asked to mark the severity of the pain on the line, the point marked by the patient is recorded in cm.

Lumbar region flexion, extension, lateral flexion and rotation movements will be measured bilaterally with a digital goniometer. Measurements will be repeated 3 times and the average value will be recorded in degrees.

The Modified Schober Test will be used to evaluate the mobility of the lumbar region. For this test, while the patient is standing, mark 10 cm upwards from the second sacral spinous process and 5 cm downwards from this protrusion (the distance between the two points is 15 cm). The patient has maximum flexion of the trunk and the distance between the two points is measured. The difference is found by subtracting 15 cm (the distance between two points in upright posture) from the value found. The fact that this difference is less than 5 cm indicates that the mobility of the lumbar region is reduced.