Arrive early. (Especially if it’s your first class.) This allows time to find a space, unroll your mat and collect your props (any blankets, bolsters, blocks or straps you need to modify poses) without disturbing anyone. It also gives you an opportunity to get into the right mind-set. If you are late, wait until after the teacher’s opening ritual before entering; otherwise you are interrupting the class while it is trying to get grounded.
Plan to stay for the whole class. If you must leave early, let the teacher know, and do it before the period of final relaxation at the end of class. Again, this is to not disturb your classmates during a key part of class — experts often say this final pose is the most important and challenging pose in yoga. Whether coming or going, try not to step on anyone’s mat.
Leave your shoes outside the door. Yoga is practiced on the floor, and tracking in dirt makes the studio unclean. The concept of grounding — literally and figuratively is very important in yoga — it’s simply easier to ground yourself if your feet are making direct contact with the floor. Pay attention to where your walking, its a major no-no to tread on someone else's mat. Barre/yoga socks can be worn.
Leave your cellphone outside the room. This is so you can fully disconnect and others won’t be disturbed. (some exceptions can be made for those on-call emergencies)
If you must leave the classroom. Wait for a short period of rest and do so quietly.
Bring water, a towel, and, if possible, your own mat. But keep your foot print small; limit your belongings near you to the essentials. Leave all other belongings in the designated area outside the classroom.
Avoid perfume or scented lotion. These can be distracting for fellow students who don’t find your fragrance as pleasant as you do.
Wear clothing appropriate for the class. You want something comfortable that you can move in that isn’t prone to a wardrobe malfunction or to bunching up and getting in your way: think stretchy, breathable fabrics.
Let the instructor know about any physical issues and preferences. If you have a physical problem or injury, or if you prefer not to receive any hands-on assists (this is when a teacher touches a student to improve their alignment or make them more comfortable), let the instructor know before class.
Clean up after class. Wipe down any borrowed mats after practice and put props away where they belong.
Be compassionate and don’t judge. The yoga practice often helps us to release pain and discomfort in the body, mind or spirit. The body might release these toxins and emotions in many different ways and in different forms, including passing gas or crying. Try not to react. It always goes back to having the yoga space being that safe inclusive comfortable space for whatever comes up and for whatever’s needed.
Be positive. Be aware of your presence and how you interact with other people.
Be respectful. To the instructor, to the class and to yourself.