Chapter 4
 By
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the end of this lesson you will be able to:
Understand the importance of regular physical activity
for enhancing & maintaining personal health throughout
the life span.
Examine the effects of regular physical activity on body
systems.
Analyze the relationship between regular physical
activity & disease prevention.
Discover ways to incorporate physical activity into daily
life.
Whatever you preference,
regular physical activity
enhances your health.
 Physical Activity – any form
of movement that cause the
body to use energy.
 Physical Fitness – the ability
to carry out daily tasks
easily and have enough
reserve energy to respond to
unexpected demands.
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 Physical
activity makes your body
stronger, increases your energy, and
improves posture.
 Cardiovascular system – physical activity
strengthens the heart muscle, allowing it
to pump blood more efficiently.
 Respiratory System – Physical activity
makes the respiratory system work more
efficiently by breathing in larger amounts
of air.
 Nervous System – Physical activity helps
you to respond more quickly to stimuli,
improving reaction time.
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It can help to reduce stress.
Allow you to manage anger
in a healthy way.
Help you look and feel
better to increase selfconfidence.
Give you a sense of pride
and accomplishment in
taking care of yourself.
Reduce mental fatigue by
bring more oxygen to the
brain.
Building self-confidence
which helps you cope
better in social
situations, such as
meeting new people.
 Giving you the
opportunity to interact
and cooperate with
others.
 Helping you manage
stress which can enhance
relationships with others.

More that 1 in 3 teens do
NOT participate regularly in
vigorous physical activity.
 Vigorous physical activity
declines significantly during
the teen years, from 73% of
9th grades to 61% of 12th
graders.
 Only 29% of teens attend a
daily physical education
class.
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Sedentary lifestyle – a
way of life that involves
little physical activity.
 May spend time watching
TV, playing video games,
or working on the
computer rather then
being physically active.
 This will lead to negative
affects on your health.

Diabetes – a disorder that
prevents the body from
converting food into
energy.
 Unhealthful weight gain,
which is linked to
cardiovascular disease.
 Osteoporosis – condition
characterized by a
decrease in bone density
, producing porous and
fragile bones.

Instead of….
 Playing video or
computer games.
 Getting a ride to a
friends house.
 Using a shopping cart.
 Watching TV or taking a
nap.
 Taking the car to the car
wash.
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Try…
 Playing soccer,
basketball, tennis.
 Walking, skating, or ride
a bike.
 Carry groceries to car.
 Gardening or mowing the
lawn.
 Wash the car yourself or
for your parents.
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 Instead
of taking the
escalator or elevator
 Try…walking the
steps!
Metabolism – the process
by which your body gets
energy from food.
 Food’s energy is
measured in heat units
called calories.
 When you are physically
active your metabolism
rises and your body will
burn more calories.

Health professionals
recommend 60 minutes of
physical activity each
day.
 Examples: walking,
biking, pick-up games
with friends, hiking,
swimming, bowling,
golfing, and tennis are
just a few examples of
activities.
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 In
this activity you
will think of ways that
different activities
benefit all three parts
of the health triangle.
Then you’ll choose an
activity and create a
plan to try it out.
1.
2.
3.
What is the difference between physical
activity and physical fitness?
Examine and briefly describe the effects of
regular physical activity on three body
systems.
Analyze the relationship between regular
physical activity and disease prevention.
4. Explain why watching T.V and walking affect
metabolism differently?
5. Why does it take longer to get the maximum
health benefit from a leisurely walk than
from swimming laps?