the participants in the study group were under 8 sessions of MET, 2 times a week, in addition to the conventional physiotherapy program.

In the content of conventional physiotherapy program for both groups; Hot Pack (20 min), Ultrasound (ITO brand 1 MHz and 1.5 W/cm2, 5 min), Transcutaneous Electrical Nerve Stimulation (TENS, 50-100 Hz, 20 min) and standard home exercises were included. The program went 5 times a week, 10 consecutive sessions. Each session lasted an average of 45 minutes.

In this study, the participants in the control group were under conventional physiotherapy program for 5 times a week, a total of 10 sessions

In the content of conventional physiotherapy program for both groups; Hot Pack (20 min), Ultrasound (ITO brand 1 MHz and 1.5 W/cm2, 5 min), Transcutaneous Electrical Nerve Stimulation (TENS, 50-100 Hz, 20 min) and standard home exercises were included. The program went 5 times a week, 10 consecutive sessions. Each session lasted an average of 45 minutes

The Janda method (Post isometric relaxation PIR Technique), one of the Muscle Energy Techniques, was used on m.piriformis, m.quadratus lumborum, m.hamstring, m.psoas major muscles in the study group. First, the dysfunctional muscle was stretched passively by the physiotherapist up to the movement barrier, and 5-7 seconds of isometric muscle contraction in the opposite direction was requested from the patient at the barrier. This practice was continued until muscle tension or joint dysfunction disappeared.

All participants performed standard home exercises consisting of stretching and strengthening. These exercises were taught to the participants by the physiotherapist in the first treatment session, and when they came to each treatment session, it was questioned whether they did it or not, and a control chart was created for exercise follow-up.

The pain severity felt by the participants in the lumbal region was evaluated with the Visual Analog Scale (VAS). VAS is the most appropriate tool for defining pain severity or intensity with its simplicity, reliability and validity as well as ratio scale features (Yakut and Kayıhan 2002). The VAS is a 10cm horizontal scale with 0 as "no pain" and 10 "very severe pain". The participant was asked to mark the severity of low back pain on the line. The marked point was measured and recorded.

The participant's sacrum bases were combined with a line, the central point of this line was marked, 10 cm above and 5 cm below the central line were marked, and the participants were asked to bend fully forward without bending their knees. If the difference in this distance is less than 5 cm, the measurement was accepted as a decrease in spinal mobility (Tousignant 2005).

In this test, the participant measures 15 cm. height, while standing upright on a block, he was asked to bend forward without bending his knees, and the fingertip-to-floor distance was measured with a tape measure (İnanoğlu and Baltacı 2014).

It was started with the participant's feet shoulder-width apart, while standing upright, arms parallel to each other and at the side of the trunk. The place of the distal end of the middle finger of the right and left hand of the participant on the thigh was marked, and he was asked to tilt his body to the side by sliding his hand down on the thigh. The end point was marked again and the distance between the Right and Left LuMLBPr Lateral Flexion Distance and the ground was measured with a tape measure and the value found was recorded in centimeters (İnanoğlu and Baltacı 2014).