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 bum 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