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Both, cardio and weight lifting are essential to your health, and it does make a difference whether person is just into cardio or just weightlifting.
What is cadiovascular exercise?
Cardiovascular or also known as aerobics focuses on developing and strengthening the cardiovascular system (which is the heart and blood vessels and improves circulation) through aerobic training. This way cadio training increases both heart and lung capacity and causes your body to produce an increased number of blood vessels, which means they all, individually and together, work more efficiently. Or in other words: cadio exercise uses large muscle groups for a continuous period of time, and during that time muscles need more oxygen to handle this exercise. Consequently your heart starts to beat faster and breathing gets faster and heavier to meet the demand for more oxygen. This way toxins and waste products are quickly removed from your body, while nutrients and oxygen are delivered to every cell of your body. Not only that: heart is a muscle that needs regular conditioning, because only well-conditioned heart can pump a large amount of blood with fewer beats than a weak heart, and only exercise can make your heart more resistant to stress, heart attack, and other health problems. There is many health benefits of cardiovascular exercise: decreased incidence of heart attack and stroke, lower blood pressure, lower ‘bad’ cholesterol and higher ‘good’ cholesterol, decreased risk of most cancers, decreased risk of osteoporosis, etc. Of course, for those who want to burn fat- cardio exercise is solution: it burns fat. And not only that- for those who want to perform better strength training program: it is easier to lift with greater intensity for longer periods if person exercises cardio also: person is more tolerant to fatigue of lactic acid burn.
On the other hand, lack of exercise leads to changes in the body that may threaten person's heart. And if lack of exercise is combined with overeating, the result is obesity and higher levels of bad cholesterol, which leads to heart disease, circulation problems.
When person trains (runs ...) he or she is increasing the efficacy of system, which mean meeting higher and higher levels of aerobic endurance. This results in increased energy and ability to preform better physically as well as mentally. Cardio exercise is also a great way to prepare for older age: research namely proves that adults who maintain a higher level of cardio exercise throughout their early and middle life, comparing to people who don't exercise, live fuller and more productive lives as seniors.
Typical cardiovascular exercise: cardiovascular exercise is any exercise that will make your heart beat faster and breathe deeper: running, walking, hiking, jogging, bicycling, dancing, aerobics, swimming... Doctors recommend 30 to 60 minutes of aerobic exercise at least 3 to 4 times a week.