Perhaps like most Americans you have some extra pounds to
(47) . You may even have tried a fad diet or two, but found
yourself right back where you started. The key to weight loss is regular
(48) activity. And surprisingly, you don’t have to give up
eating or make the gym your second home to see long-term, (49)
effects. Your body needs a certain amount of energy to
maintain basic (50) such as breathing, blood circulation and
digestion. The energy required to keep your organs functioning is referred to as
the resting or basal metabolic rate. Any time you are active,
(51) energy is required. It is obtained from glycogen and fat
stored in the blood, liver, and muscles. The key to losing weight is to draw on
the fat rather than on the carbohydrate reserves. Which of the
two energy sources you use depends on the intensity and (52)
of your activity. The higher the intensity, the more your body will
pull from the stored carbohydrates. The lower the intensity, the more your body
will (53) on fat as its fuel. Aerobic
exercise is most (54) for weight loss. When you perform
aerobic activities you (55) contract large muscle groups such
as your legs and arms. Walking, running, rollerblading, swimming, dancing, and
jumping jacks are all forms of aerobic activity. Surprisingly,
if your aerobic activity is low to moderately intense and of long duration, you
will bum more fat than if you had (56) in a short burst of
high-intensity exercise. In short, a brisk 30-minute walk will burn fat while a
100-yard sprint will bum glycogen. [A] positive
[I] participated [B]
additional
[J] rely [C]
duration
[K] cut
[D] effective
[L]
repeatedly [E] shed
[M] uses [F] physical
[N] little [G] food
[O] obvious
[H] functions