1. Discuss: What does it mean to be fit?
The 4 S-factors: Suppleness,
strength, speed and stamina.

2. What does it mean to be fit?
If you are fit, your body is well set up for exercise.
For exercise your muscle cells need energy.
Where does this come from?
oxygen carbon dioxide
respiration
water
glucose
energy
Which organ systems provide the things you need
for respiration?

3. Explore
How much does pulse rate change
with different types of activities?

4. Summary – Pulse rate activity
1. Why does your pulse change when you do some
activities?
2. Which activity gave the highest pulse rate?
3. What sort of activity would give you a higher
pulse rate?
4. What might you be doing if you had a lower
pulse rate?
5. When your heart is beating faster, what is
happening in your body?
6. Why do different people have different pulse
rates?

5. What process is
this animation
showing?
Where is it
happening?
How is this linked
to fitness and
stamina?

6. Explain
Sequence correctly what happens
inside our bodies when we run up
and down the stairs.

7. When I started to run up and down the This was detected by my brain which
stairs… sent nerve impulses to the heart.
1 6
Glucose reacted with oxygen, releasing
The heart started to beat faster and
energy. At the same time, carbon
harder to move my blood faster.
dioxide and water were produced.
The energy needed for this came from a
chemical reaction in the muscle cells My heart rate went back to normal.
called respiration. 3 10
Very soon, my muscle cells started to My heart and blood system was able to
run short of oxygen and acidic carbon supply enough oxygen to the muscle
dioxide started to build up in the blood. cells.
When I stopped running up and down
My leg muscles contracted to lift my
the stairs, the respiration in my muscle
body.
cells slowed down.

8. When I started to run up and down the This was detected by my brain which
stairs… sent nerve impulses to the heart.
1 6
Glucose reacted with oxygen, releasing
The heart started to beat faster and
energy. At the same time, carbon
harder to move my blood faster.
dioxide and water were produced.
7 4
The energy needed for this came from a
chemical reaction in the muscle cells My heart rate went back to normal.
called respiration.
3 10
Very soon, my muscle cells started to My heart and blood system was able to
run short of oxygen and acidic carbon supply enough oxygen to the muscle
dioxide started to build up in the blood. cells.
5 9
When I stopped running up and down
My leg muscles contracted to lift my
the stairs, the respiration in my muscle
body.
cells slowed down.
8 2

9. Check list
1. Can you explain what fitness means?
2. What are the 4 S-factors
3. Name the chemical reaction that releases energy
to keep your muscles moving.
4. Explain why it is important that our organ
systems work efficiently.
5. Suggest ways of evaluating whether a fitness
programme is working.