If you are looking for peace and inner harmony but don't feel that your gym sessions aren't bringing you that, then maybe you are doing the wrong exercise.
Striving for inner peace and harmony should be a priority in life I think; unfortunately we don't seem to have time to "find ourselves" any longer these days. We are too busy to allow ourselves inner peace and harmony. That is something we do when we get older, now you just want to live while you can.
If the above reasons don't appeal to you and you are happy with your inner peace then congratulations to you. You might however be interested to know that will give you great flexibility, strength, and expand your ability to concentrate.
All these things come with yoga, you learn how to control your body and you build up your concentration span and strengths. Doing yoga is more than sitting on the floor humming as many thinks. There are several types of yoga so do try out a few ones and see which one is the right for you.
If you do yoga, what is your reason for doing it?