Talk is cheap. If you can't carry on a conversation while you're exercising, you may be training too hard. Keep on Exercising. If you are 25 pounds overweight, you have nearly 5,000 extra miles of blood vessels through which your heart must pump blood. Hit What You Aim For.
Muscle is the primary target organ of aerobic training.
The effects of aerobic training on muscle involves the use of oxygen as it relates to energy production. Research shows that cardiac rehab programs that include exercise reduce risk of death by 20 percent. When you stand up, if you didn't have valves in your veins, all the blood in your body would literally fall downward, filling up your legs and feet. Aerobic training improves the condition and efficiency of your breathing muscles so that your body can utilize more lung capacity during exercise.