From Leslie: Yoga means union. Union of body mind and spirit. Union of the shadow self with the enlightened self. Yoga is a means of self discovery.
Then what? What happens after self-care, self-discovery and self-worth? The purpose then is to be in the service of humanity. Or to be in the service of God thru the service of humanity. You first feel peace within yourself then you spread the goodwill and union to your family, community, then the world at large.
But – you may say- I only care about the fitness and health benefits of yoga. I just want to be more flexible.
My reply would be that discovering your best physical self as far as balance, flexibility and strength is the yoga path. So if you practice to improve your health and fitness, you are practicing for the right reason. Enjoy your practice and your exploration of the question –