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The key to strengthening your heart is keeping your pulse rate high enough, but not
too high. Research by Dr. Kenneth Cooper at the Aerobics Research Institute and by others
has shown the threshold level to be 70-80% of your maximum heart rate. This isn't
necessary in the beginning; but after you've established a program, maintaining this heart
rate for 30 minutes, three times a week, will strengthen your lungs and heart, improve
circulation of blood and oxygen and tone up your muscles. Note: Anyone with high
blood pressure, who is overweight, or has had a heart problem
or family history of heart disease, should consult a doctor before taking part in
strenuous aerobic exercise.
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