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Being told to "stand up straight" probably seemed like a rite of passage in your teenage years, but those nagging adults were onto something. Good posture supports good health.

Proper body alignment can help prevent excess strain on your joints, muscles and spine � alleviating pain and reducing the likelihood of injury. As a bonus, correct posture can boost your productivity and mood, as well as help you use your muscles more efficiently. Improving your posture will likely take some time and conscious effort, but the feel-good benefits are worth it.

So what does proper posture look like? Use the "wall test" to find out:

• Stand so that the back of your head, your shoulder blades and your buttocks touch the wall, and your heels are 2 to 4 inches from the wall.
• Put a flat hand behind the small of your back. You should be able to just barely slide your hand between your lower back and the wall for a correct lower back curve.
• If there's too much space behind your lower back, draw your bellybutton toward your spine. This flattens the curve in your back and gently brings your lower back closer to the wall.
• If there's too little space behind your lower back, arch your back just enough so that your hand can slide behind you.
• Walk away from the wall while holding a proper posture. Then return to the wall to check whether you kept a correct posture.

Unfortunately, ideal posture is often the exception rather than the rule. Poor posture can affect you head to toe, contributing to a number of problems.

• Headache. Poor posture can strain the muscles at the back of your head, neck, upper back and jaw. This can put pressure on nearby nerves and trigger what are known as tension-type or muscle-spasm headaches.
• Back and neck pain. Pain and tightness or stiffness in the back and neck can be due to injury and other conditions such as arthritis, herniated disks and osteoporosis, but poor posture is a common contributor. Though rarely life-threatening, back and neck pain can be chronic and reduce your quality of life.
• Knee, hip and foot pain. Muscle weakness, tightness or imbalances, lack of flexibility, and poor alignment of your hips, knees and feet may prevent your kneecap (patella) from sliding smoothly over your femur. The ensuing friction can cause irritation and pain in the front of the knee, a condition known as patellofemoral pain. Poor foot and ankle alignment also can contribute to plantar fasciitis, a condition in which the thick band of tissue connecting your heel to the ball of your foot (plantar fascia) becomes inflamed and causes heel pain.
• Shoulder pain and impingement. Your rotator cuff is a group of muscles and tendons that connect your upper arm to your shoulder. Muscle tightness, weakness or imbalances associated with poor posture can cause the tendons in your rotator cuff to become irritated and cause pain and weakness. A forward, hunched posture also can cause these tendons to become pinched (impinged). Eventually, this can lead to a tear in the rotator cuff tissue, a more serious injury that can cause significant pain and weakness and limit your ability to carry out daily activities.
• Jaw pain. A forward head posture may strain the muscles under your chin and cause your temporomandibular joint (TMJ) to become overworked. This may result in pain, fatigue and popping in your jaw, as well as difficulty opening your mouth, headaches and neck pain.
• Fatigue and breathing problems. Poor postural habits may restrict your rib cage and compress your diaphragm. This can reduce lung capacity, leading to shallow or labored breathing, fatigue and lack of energy, which can affect your overall productivity.

Improving your posture can help prevent or reverse many of these conditions. You'll be amazed to see how your quality of life can improve � simply by standing a little taller.