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Cardio improves life span, keeps weight in tact, decreases diabetes risk, protects you from cardiovascular disease, lowers chelestrol and reduces blood pressure,

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http://www.healthychildren.org/English/healthy-living/fitness/pages/Body-Composition-and-Flexibility.aspx

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https://www.ahealthyphilosophy.com/article/muscular-endurance-a-brief-overview

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Breaking Down Common Myths About StretchingThere are three common myths associated with stretching. Myth 1:  Stretching helps you warm-up before an activity.Reality: In fact, the opposite is true; you need to be warmed-up before you stretch.  The muscles and connective tissue surrounding your joints need to be warm before stretching. Warm-up your muscles by doing a short 5-10 minute aerobic session. This elevates your heart rate, warms up your body and makes you begin to sweat.Myth 2: Stretching before being active can prevent injuries.  Reality: This claim or myth is based on the theory that tight, unstretched muscles are more likely to be strained during an activity. However, researchers have found no clear evidence that proved this claim as true or not.  In fact, any given injury may be caused by one or more factors, such as the type of activity, your fitness level, or previous injuries. Stretching is just one small factor, among many.Myth 3: Stretching before or after being active will prevent muscle soreness. Reality: This claim is based on the belief that stretching can help increase circulation to muscles, which will help reduce or prevent muscle soreness. In fact, researchers have not found much evidence to support this.  For instance, whether you stretch before or after a vigorous exercise session, you may still experience muscle soreness (or delayed onset muscle soreness) following the session. So far, our understanding of how stretching may help to manage or eliminate muscle soreness is not well understood.

http://www.healthyalberta.com/720.htm

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"CardioRespriratory Exercise is often referred to as cardio, endurance or aerobic exercise. Cardiorespiratory activity relies on your body's ability to provide your muscles with enough oxygen to carry out sustained exercise."

"In addition to helping manage your weight, engaging in Cardio offers major benefits."

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http://www.livestrong.com/article/104624-major-benefits-cardio-respiratory-fitness/

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"Static StretchingMost people have done some static stretching. This type of stretching involves slowly moving a selected joint in a given direction to a point where you “feel” the stretch, then holding the position for 15-60 seconds.Using the static method, it slowly stretches the muscle and connective tissue associated with that joint. For instance, when you bend over to reach for your toes and then hold the position, you will be able to feel the stretching that occurs in muscles near your hip and lower back. Dynamic StretchingThis type of stretching includes movement in a controlled manner. Typically, the movement starts gently, then slowly increases in reach or speed. For instance, you may begin by doing some slow, gentle “arm circles” (by holding your arms out horizontally, them making circles in the air), then gradually increase the width of the circles and the speed of your circling motion.Such types of dynamic stretching need to be done with care, as overly energetic or sudden movements may lead to pain or injury. "

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http://generalfitness.tripod.com/id1.html

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http://exercise.about.com/od/cardioworkouts/a/cardio_exercise.htm

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http://www.fitness.com/articles/660/the_importance_of_flexibility.php
"Flexibility isn’t just about touching one’s toes or doing the splits. In actuality, flexibility is simply the amount of movement available at each joint. Flexibility is important to staying healthy and avoiding pain and injury."

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http://www.shapesense.com/fitness-exercise/articles/cardiorespiratory-fitness.aspx

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http://www.fitday.com/fitness-articles/fitness/strength-training/how-endurance-strength-training-can-benefit-your-health.html