What is the best way to relieve stress with out harmful side effects in the body?

First of all, I do some basic warm-up for the client. Example, a very basic stretching1

The best way to relieve stress is to make our clients fully prepared physically, emotionally & mentally by letting them feel comfortably in order for us to gain their trust to do the rest. As we are aware of what is good and bad according to their current state and health history. With their preference and choices we will be able to know which is which that is best and that would suits to his current condition. We are also setting goals for clients who has some sort of problems. And we tried to educate our clients about our services and how it will help them presently and in future.