Participants allocated to this group will receive a 10-week Pilates exercise program with each session having a duration of 45'.

Participants allocated to this group received general consulting instructions and a home-based general exercise sheet

The program will be individually supervised and will be conducted twice a week at the physiotherapy center.

• Slow execution of 7-10 repetitions of the following Pilates exercises: Pelvic Curl, Pilates Single Legs Lifts & Leg Change, Twist Supine Pilates exercise, Chest Lifts Pilates Exercise, Chest Lift with Rotation Pilates exercise, 100's Prep Pilates Exercise, Single Leg Stretch Pilates Exercise, Front Support Pilates Exercise and Basic Back Extension Pilates Exercise. After the 6th week, while the person will be familiar with the basic exercises of the Pilates method the following exercises will be added: Leg Pull Front, Side Bend Pilates Exercise, Sphinx - Abdominal Lift Pilates Exercise, Shoulder Bridge Prep Pilates and Shoulder Bridge Pilates Exercise. Each session will be completed with breathing exercises and stretching exercises of the torso and lower limbs for 5 minutes.

VAS is a card with an uncalibrated scale ranging from 0-100mm on the one side with each millimeter representing one pain level (0 representing no pain and 100 representing the worst pain in life). The patient subjectively estimated their pain level by marking a vertical line on the uncalibrated scale between 0 and 100.

Then the exact value of pain intensity could be obtained with a single ruler. Hence, the higher the value, the more intense the pain. VAS is widely used as it is easy to implement and is characterized by good psychometric propert

Disability associated with low back pain in the last 24 hours will be assessed using the Greek version of the Roland Morris Disability Questionnaire (Boscainos et al., 2003). This questionnaire has showed good test -retest reliability with intraclass correlation (ICC) ranging from 0.42 to 0.91 (Macedo et al., 2010), while Boscainos (2003), reports that the internal consistency reliability for the Greek version reached a Cronbach's alpha coefficient of 0.885. This questionnaire consists of 24 items that are related to daily activities which patients often report difficulty performing due to low back pain. Every positive answer earns a point and the final score is calculated by adding all the points. Thus, the higher the score is, the greater the limitation (Stratford, 1996).

The TUG test is a performance-based measure of functional mobility that was initially developed to identify mobility and dynamic balance impairments in older adults (Cameron and Monroe, 2007; Swearingen and Brach, 2001; Podsiadlo and Richardson, 1991). The TUG test has demonstrated high interrater and intrarater reliability when used to examine elderly adults (Cameron and Monroe, 2007; Swearingen and Brach, 2001). The test requires the subject to rise from a chair, walk three meters at a comfortable pace to a mark placed on the floor, turn around, walk back to the starting point, and return to sitting on the chair. The test's score is the time it takes the subject to complete the test.

Participants will be asked to write down in a special diary the number of pills administered (anti-inflammatory and/or painkillers) during the follow-up period. The log will be kept kept on a weekly basis and the assessor will collect the data by phone 2-3 times a month.