In a busy city like Istanbul where people are stressed in life, in traffic and in the workplace many people could benefit from yoga and meditation.
The room where the lessons are given, is like an oasis of stillness where you breath, move and exercise with a a higher lever of intensity. You leave your stress behind and connect to your body in a relaxing way.
There is a wide range of traditional systems of physical exercise and meditation. Choose the one that fits you most.
Many yoga centers offer classes for beginners to well experienced practricioners of yoga. Some do offer retreats as well, and teacher training courses. One of those is Cihangir Yoga. More information on their website
For an overview of yoga centers in Istanbul go to this site