Chapter 15 Staying Physically Active: A Way of Life
355
which are necessary for maintaining
good posture. Posture is the position
of your body when you are standing
or sitting. Having erect posture when
standing helps your clothes hang
properly so you will look your best.
Having erect posture when sitting
helps you look and feel more alert.
Having good posture also helps you
avoid back problems.
Many teens go through a stage
when they feel clumsy and awkward.
You will fi nd exercise can help you
move more gracefully, 15-4. Agility,
balance, and coordination developed
through exercise will be refl ected in all
your movements.
Exercise burns calories. This is good
news for people who are overweight.
Thirty minutes of moderately intense
activities will burn about 200 extra calories.
This may not seem like much. When
you multiply the calories burned over an
extended period, however, the results are
impressive. For instance, doing 30 minutes
of moderate exercise fi ve days a week will
burn about 52,000 extra calories per year.
That is nearly 15 pounds of body fat. Those
who combine their exercise program with a
low-fat diet that is moderate in calories can
lose even more weight.
People who do not have weight
problems should not overlook the
benefi ts exercise can have for them.
Over a lifetime, many people experience
a slow weight gain by eating an extra
75 to 150 calories per day. An exercise
program could easily burn up these
excess calories and help keep weight at a
healthy level throughout life.
Disease Prevention
Exercise can help reduce the risk
of developing several diseases. These
include osteoporosis, coronary heart
disease (CHD), diabetes mellitus, and
stroke. Physical activity and exercise
boost your immune system. Exercising
regularly helps your body balance
hormones to protect cells from damage
that may lead to some cancers. Exercise is
not guaranteed to increase your life span,
but it can improve your quality of life. It
can help you have the energy you need
for daily work and leisure activities.
Improved Mental
Outlook
For many people, exercise creates
a feeling of well-being. Adolescents
who exercise regularly state they have
improved self-control, self-esteem, and
body image. They also report greater
alertness and better school performance.
15-4 The balance and agility you
develop through activities like ice skating
will be reflected in all your movements.
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Chapter 15 Staying Physically Active: A Way of Life
355
which are necessary for maintaining
good posture. Posture is the position
of your body when you are standing
or sitting. Having erect posture when
standing helps your clothes hang
properly so you will look your best.
Having erect posture when sitting
helps you look and feel more alert.
Having good posture also helps you
avoid back problems.
Many teens go through a stage
when they feel clumsy and awkward.
You will fi nd exercise can help you
move more gracefully, 15-4. Agility,
balance, and coordination developed
through exercise will be refl ected in all
your movements.
Exercise burns calories. This is good
news for people who are overweight.
Thirty minutes of moderately intense
activities will burn about 200 extra calories.
This may not seem like much. When
you multiply the calories burned over an
extended period, however, the results are
impressive. For instance, doing 30 minutes
of moderate exercise fi ve days a week will
burn about 52,000 extra calories per year.
That is nearly 15 pounds of body fat. Those
who combine their exercise program with a
low-fat diet that is moderate in calories can
lose even more weight.
People who do not have weight
problems should not overlook the
benefi ts exercise can have for them.
Over a lifetime, many people experience
a slow weight gain by eating an extra
75 to 150 calories per day. An exercise
program could easily burn up these
excess calories and help keep weight at a
healthy level throughout life.
Disease Prevention
Exercise can help reduce the risk
of developing several diseases. These
include osteoporosis, coronary heart
disease (CHD), diabetes mellitus, and
stroke. Physical activity and exercise
boost your immune system. Exercising
regularly helps your body balance
hormones to protect cells from damage
that may lead to some cancers. Exercise is
not guaranteed to increase your life span,
but it can improve your quality of life. It
can help you have the energy you need
for daily work and leisure activities.
Improved Mental
Outlook
For many people, exercise creates
a feeling of well-being. Adolescents
who exercise regularly state they have
improved self-control, self-esteem, and
body image. They also report greater
alertness and better school performance.
15-4 The balance and agility you
develop through activities like ice skating
will be reflected in all your movements.

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