There are numerous reasons why we become inflexible. Perhaps we feel if we let go of control things may slip into chaos. Challenge this concept by letting yourself experience more flexibility in your interactions, your beliefs, and your schedule. Notice how this affects you emotionally and physically. Is it possible that you might experience less (not more) stress when you are more flexible? Flexibility may be a matter of trust of yourself and others in a given situation. Letting go of outdated thoughts and beliefs about yourself or others, and rigid adherence to the way things "should be" can be scary at first but also immeasurably liberating with practice. Cognitive flexibility can be a life changing experience. Give it a try, just for today.