Check the training, qualifications and experience of your teacher.
If you're a beginner, take a beginners' class, even if you think you're fitter or more flexible than the average newbie.
Always inform your yoga teacher when you first meet them about any injuries, niggles or worries you have.
Don't push yourself too much. The practice is about progression at your own pace, not keeping up with other class members.
READ MORE
Ask questions if you're unsure of a move or posture.
Don't be afraid to tell your teacher if something is uncomfortable, or to come out of a posture early if it's becoming too much.