A basic excersice is one done at the barre. Put one foot in the lower barre in a way that the leg is right, aside your body and do a plie then a releve with your supporting leg, repeat it about ten times. Then bend your waist (not your back!) and try to reach your leg with your chest, hold the position a few seconds and slowly unbend your body. Then bend and reach your leg with your shoulder.
That's what I basically do to stretch before a class. Hope it give you results and forgive me if you not understand well, my english is not as good as i want. Take care of yourself and just feel comfortable with the excersices and keep in your limits do not over force. Luck![/i]