That painful tightening in your upper back could be the result of sitting at your computer too long. Get up and get moving. Walk around gently shaking your arms. Stretch carefully to try to loosen the muscles. Also, you can sit in your chair and bend forward at the waist and breathe deeply.
Riding in the car is a common cause of back pain since we spend so much time in the car every day. When driving, your seat needs to be adjusted allowing you to easily reach the pedals and the wheel without straining your back.
You may be tempted to get up and walk around with a hurt back, thinking you can fight through the pain, but it is imperative that you give your injury proper time to heal. A pulled, strained or torn muscle will only hurt twice as much and take twice as long to heal if it's aggravated.