Before the start of most yoga classes, the teacher asks if anyone has any injuries or conditions that would affect his or her practice. Some teachers like Ana Forrest ask their students to write a short history of their conditions or injuries on a name tag. If you keep quiet about old or new injuries, sensitive areas (like supertight hamstrings) or the fact that you're pregnant, the teacher may unknowingly give you poses that aren't good for you or make inappropriate adjustments. Speak up. The more your teacher knows about your body, the more he or she can offer modifications or adjust his or her way of touching you.