The plates exercise program is concerned with the following main principles: efficient breathing, mental concentration, relaxation, correct spine elongation and posture, correct abdominal muscle control over spine stability and mobility, correct function of each upper and lower limb, precision, lowing integrated movement, and achieving muscle strength and stamina.

Therapeutic exercise program was designed according to the American Collage of Sports Medicine's recommendations for healthy people. The exercise program was conducted using low- to moderate-intensity therapeutic exercises. These therapeutic exercises included a short educational talk that provided information on proper body mechanics, the benefits of exercise, realistic goal-setting, and overcoming common barriers (such as fear) when developing an exercise routine.

Participants in the control group have no exercise in this study.

plates and therapeutic exercises applied on young adults

A visual analogue scale (VAS) was used to their level of pain subjects experienced throughout these activities. The VAS is comprised of a 10 cm horizontal line, wherein 0 indicates "no pain" and 10 indicates "unbearable pain" (Sang, Sang, Dong and Byung, 2016). Participants were asked to mark the strength of their ongoing musculoskeletal pain on the horizontal line.

The Back Depression Inventory (BDI) was used to determine patients' level of depression; each item on the scale is given a score of one to three, allowing for a maximum test score of 63 according to form. A subjects' total overall score is then used as an indicator of the presence and severity of depression: a total score lower than 10 indicates no depression, a score of 10-17 indicates mild depression, a score of 18-29 indicates moderate-to-severe depression, and a score of 30 or above indicates severe depression (Muyan, Sancak and Demir, 2017).

The Turkish version of the Nottingham Health Profile (NHP) was used to assess participants' health-related quality of life. The NHP is a general quality of life questionnaire that measures individuals' perceived health problems and the extent to which these problems affect their normal daily activities. The questionnaire is comprised of 38 items and evaluates six dimensions of healthy individuals' health statuses, these include: energy (three items), pain (eight items), emotional reactions (nine items), sleep (five items), social isolation (five items) and physical activity (eight items). The test includes a list of yes/no questions. Each section yields a score between 0 and 100 for each subject, where 0 represents the best possible health status and 100 represent the worst possible health status (Liang, Wang and Tao, 2015).

The Oswestry Disability Index (ODI) questionnaires were distributed to participants and scored according to the study by Yakut et al. The research authors noted that some of the questions on the ODI are directly related to physical activities (lifting, walking, etc.). The level of disability was evaluated using the ODI, which is a condition specific questionnaire regarding how low back pain affects activities of daily living. The questionnaire rates 10 different activities based on a six-point scale, with 0 for ''no pain at all'' and 5 for ''cannot perform due to pain''. The higher the score, the greater the disability the subject was deemed to have (Rodríguez-Romero, Bello, Vivas Costa and Carballo-Costa, 2018).