Effects of Aerobic and Diaphragmatic Exercises on Choir Singers

The goal of this randomized-controlled study is to compare the effects of diaphragmatic breathing exercise training provided by a physiotherapist and aerobic exercise training applied in addition to diaphragmatic breathing exercise training provided by a physiotherapist on respiratory functions and voice performance in choir singers. The main questions this study aims to answer are: * Is diaphragmatic breathing exercise training provided by a physiotherapist effective in improving the respiratory functions of choir singers? * Is diaphragmatic breathing exercise training provided by a physiotherapist effective in improving the vocal performance of choir singers? * Does aerobic exercise training applied in addition to diaphragmatic breathing exercise training provided by a physiotherapist have a greater effect on improving the respiratory functions of choir singers compared to diaphragmatic breathing exercise training applied alone? * Does aerobic exercise training applied in addition to diaphragmatic breathing exercise training provided by a physiotherapist have a greater effect on improving the vocal performance of choir singers compared to diaphragmatic breathing exercise training applied alone? The research data are going to be collected by Sociodemographic Information Form, International Physical Activity Questionnaire-Short Form, Self-Performance Evaluation Questionnaire, Vocal Fatigue Index, Singing Voice Handicap Index, measurement of maximum phonation time, pulmonary function test, maximal inspiratory and expiratory pressure measurement, and 6-minute walk test.