23 individuals will be included in this group. Structured pes planus exercise group; short foot exercise, towel picking exercise, toe walking, heel walking, tandem walking, eccentric gastrosoleus stretching at the edge of the stairs, picking objects from the ground with the toes, balance exercises on one foot. The purpose of all these exercises; The aim is to increase the medial longitudinal arch by contracting the intrinsic muscles of the foot, and to improve the balance at the same time. Walking exercises will be performed in the form of 10 meters and 10 rounds, other exercises will be performed with 30 repetitions for both feet and the whole session will be 40 minutes in total.

23 individuals will be included in this group. Wii-based exergame group, Nintendo wii game console balance games; In the literature, frequently used ones in different disease groups will be selected and played. In this context, Penguin Slide, Tightrople Tension, Tilt Table, Soccer Heading and Balance Bubble games will be played in each session under the supervision of an expert physiotherapist (executive), each game will be 8 minutes and the session will be 40 minutes in total. The motion sensor will be placed directly opposite the Balance Board. All games are played in a standing upright position on a double-footed Balance Board.

23 individuals will be included in this group. The lower extremity strengthening and balance exercises within the Becure Balance System, developed in cooperation with the Physiotherapist, Academician and Engineer, will be performed by the Wii-based serious game group through the Wii Balance Board. Three games, Balance Surf, Balance Adventure and Balance Maze, which are among the balance games within the Becure Balance System application, will be played for 40 minutes in each session under the supervision of an expert physiotherapist (executive). The Wii Balance Board will be connected via Bluetooth from the menu in the Becure application. Then the Person will stand on the Balance Board and transfer weight in four directions in line with the instructions of the game on the screen.

Structured pes planus exercise group; short foot exercise, towel picking exercise, toe walking, heel walking, tandem walking, eccentric gastrosoleus stretching at the edge of the stairs, picking objects from the ground with the toes, balance exercises on one foot. the purpose of all these exercises; The aim is to increase the medial longitudinal arch by contracting the intrinsic muscles of the foot, and to improve the balance at the same time. Walking exercises will be performed in the form of 10 meters and 10 rounds, other exercises will be performed with 30 repetitions for both feet and the whole session will be 40 minutes in total.

The severity of the pes planus will be determined by the navicular drop test. The person will be asked to sit on a chair with bare feet touching the ground without giving any weight, the navicular tubercle will be found on the medial of the foot and the height from the ground will be marked on a plain white card. Then, the person will be asked to stand up and the level of the navicular tubercle in the collapsed medial arch with full weight-bearing will be marked again on the same card. The difference will be recorded in centimeters, the measurement will be repeated for each foot. As a result of the exercises, the measurement will be repeated and it will be checked whether the difference has decreased.

Static foot pressure analysis; It will be done with a Sensor Medica Maxi brand pedobarographic analyzer. The person is asked to stand in a comfortable position in a certain area of the platform, barefoot, heels at the same level, feet in the width of the pelvis for 5 seconds, still and upright. In the static analysis, the valgus angle of the ankle will be evaluated separately for the right and left feet. The captured images and data will be transferred to the computer via Freestep software and saved.

Dynamic foot pressure analysis; It will be done with Sensor Medica Maxi brand pedobarographic analyzer compatible with Freestep software. Variables will be recorded by executing 6 laps at normal walking pace on a 2 meter platform. In the dynamic analysis, the contact area (cm²) of the anterior, middle and posterior parts of the foot, the medial longitudinal arch, the lateral longitudinal arch, the contact area of the medial heel with the ground (cm²) will be recorded separately for the right and left feet.

The Jack's finger lift test will be used to assess whether the pes planus is flexible. The toe will be passively dorsiflexed by the therapist when the patient feels comfortable and does not put weight on the foot in the sitting position, while the medial longitudinal arch rises will be interpreted in favor of flexible pes planus. Flexibility assessment will be made at the beginning of the study, no elevation in the medial longitudinal arch during testing will be considered as rigid pes planus and these individuals will not be included in the study.

Femoral anteversion angle of individuals will be evaluated with Craig test. The person will be asked to internally rotate each lower extremity, respectively, in the prone position with the knees flexed to 90 degrees. The angle formed at this time will be measured with a goniometer. In order for the movement not to be compensated, care will be taken that the opposite hip does not rise from the bed. Each measurement will be repeated three times and the average value recorded.