填空题 Walking-like swimming，bicycling and running—is an aerobic exercise, 1 builds the capacity for energy output and physical endurance by increasing the supply of oxygen to skin and muscles. Such exercises may be a primary factor in the 2 of heart and circulatory disease.
As probably the least strenuous, safest aerobic activity, walking is the 3 acceptable exercise for the largest number of people. Walking 4 comfortable speed improves the efficiency of the cardio respiratory system 5 stimulating the lungs and heart, but at a more gradual rate 6 most other forms of exercise.
In one test, a group of men 40 to 57 years of age, 7 at a fast pace for 40 minutes four days a week, showed improvement 8 to men the same age on a 30 minute, three—day—a—week jogging program in the same period. Their resting heart rate and body fat decreased 9 . These changes suggest 10 of the important-even vital—benefits walking can 11 about.
Walking 12 burns calories. It takes 3,500 calories to gain or 13 one pound. Since a one. hour walk at a moderate pace will 14 up 300 to 360 calories. By walking one hour every other day, you can burn up a pound—and—a—half monthly. or 18 pounds 15 -providing there is no change in your in-take of food. To 16 weight faster, walk an n hour every day and bum up 3 pounds a month, or 36 pounds a year.
17 your age, right now is the time to give your physical well-being as much thought as you 18 to pensions or insurance. Walking is a vital defense 19 the ravages of degenerative diseases and aging. It is nature"s 20 of giving you a tuneup.