Consult your doctor if you are having pain or difficulty arching your back. She can help you identify the problem and point you toward specialists who can help fix it before it becomes worse. Do not try and extend your back if you are experiencing pain.
Incorporate back stretching exercises into your everyday routine. This includes lying on your front and lifting your upper body off of the floor. Hold for five to ten seconds and then repeat ten times.
Stretch your arms to give your back even more flexibility. Place one arm in front of your chest and hook your other arm around the elbow to pull the muscle even more. Hold for a few seconds before releasing.
Do the bridge pose on a yoga mat. Lie on your back with your knees bent and your arms at your sides. Lift your hips and raise your torso. While holding the pose, slowly inch your hands and feet together, pushing yourself to stretch more a little bit each time.
Watch yourself dance in a dance studio mirror to check your form. Be conscious of your back and the arch of your back when dancing.