How much time do you spend thinking reasons why you "can't" do something? Why you can't lose weight, why you can't get the job you want, why you can't buy the house or car you want...etc.What if, instead, you asked yourself "How can I?" When you tell yourself you can't, you shut yourself off from any possibility of doing what you want and destroy any motivation to act. When you ask yourself, "How can I?" you open up your mind to think of possible solutions and you are motivated to act.
Yoga studios tend to have a certain look. Part of this has to do with the practical needs of doing yoga. For example, a carpeted floor tends to hold more dust, and is less desireable for a practice where your face is regularly close to the floor. Part has to do with the rather long and highly fluid history of the practice of yoga.
When you come into a yoga class it is very typical to spend some time sitting quietly. I will often explain to my students that this time is not some sort of 'before', but is a part of the class. In any 'mind/body' modality it is important to foster the conditions where the connections of the stream of thought and the stream of movement can become seamless.
What a person typically looks for from a personal trainer when they seek one out is typically different from what they look for from a yoga teacher. Just so the usual image of that a trainer looks and acts like tends to be different. Less so today, when there is so much overlap, with trainers starting to teach yoga, and yoga teachers offering individualized services that are more westernized than they used to be.