Gently, lift your head and curve your lower back down towards the floor. Hold for 5 to 10 seconds. Then reverse the process. Gradually lower your head and curve your back up towards the ceiling. Alternate positions 5 to 10 times.
Some people also get a sore back when they sit for a while.
Placing a pillow in the small of the back for support can help here. Spread your legs apart, fold your arms over your chest, and tuck your chin to your chest. Now slowly curl your trunk downward. When you are fully flexed, relax for a few seconds. Then uncurl slowly into the upright position, raising your head last.