You will learn
- Explain benefits of exercise.
- Measure pulse safely.
- Describe changes in breathing.
- Plan a safe routine.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
Words to know
activity that makes the body work harder
the beat of blood felt at the wrist or neck
how well the body copes with activity
gentle activity to prepare the body
1. Discover: The pulse count
Adwoa counts her pulse at rest: 80 beats in a minute. After a minute of jogging on the spot, she counts again: 120. “My heart is working harder,” she says. After five minutes of rest it slows back down. “A fit heart recovers quickly,” says her teacher.
Think: Why did the pulse rise?
2. Understand: Exercise
Idea 1: What exercise does
Regular exercise strengthens muscles, thickens bones, makes the heart and lungs work better and improves mood and sleep. It builds fitness.
Idea 2: Pulse and breathing
When we exercise, muscles need more oxygen, so the heart beats faster and we breathe faster. We can feel the pulse on the wrist and count it for a minute.
Idea 3: A safe routine
Begin with a warm-up, do the activity, then cool down and drink water. Children need about 60 minutes of moderate activity daily.
3. Worked examples
Example 1 (I show you): Measure
Pulse.
- Fingers on wrist.
- Count 15 seconds.
- Times four.
Answer: Count for 15 seconds then multiply by 4.
Example 2 (We do it together): Predict
After jogging.
- Muscles need oxygen.
- Heart faster.
- Breathing faster.
Answer: Pulse and breathing rise.
Example 3 (You try): Plan
Weekly.
Show the steps and answer
- Warm up.
- Activity.
- Cool down.
Answer: A routine has all three parts.
Did you know?
The adult heart beats about 100,000 times a day, and regular exercise lowers the resting pulse.
Why this matters
Exercise protects health for life.
4. Explore: Pulse investigation
Measure resting pulse, then pulse after one minute of marching on the spot.
- Find the pulse on your wrist.
- Count for 15 seconds and multiply by 4.
- March gently for one minute.
- Count again and compare.
Think about it: what did you notice?
What did you notice? Pulse rose after exercise and settled after rest.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- ___ makes the body work harder.
- The ___ is the beat felt at the wrist.
- ___ is how well the body copes.
- A ___ prepares the body.
Guided practice
Question 1. What is exercise?
Active work.
Question 2. What is pulse?
Heart beat.
Question 3. What is a warm-up?
Prepare the body.
Independent practice
Level 1: Start
- What is exercise?
- What is pulse?
- What is a warm-up?
- How long daily?
- Name an exercise.
Level 2: Grow
- Why does pulse rise?
- Why warm up?
- Why drink water?
Level 3: Stretch
- Measure pulse.
- Compare before and after.
- Plan a routine.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Plan your week of exercise.
Show a sample answer
Include warm-up.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Also heart and lungs.
Fix: Stop and tell an adult.
8. Lesson summary and revision card
- I can explain benefits of exercise.
- I can measure pulse safely.
- I can describe changes in breathing.
- I can plan a safe routine.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Exercise strengthens muscles, bones and heart.
- It raises pulse and breathing rate.
- Warm up before and cool down after.
- Children need about an hour of activity a day.
11. Next lesson
Next lesson: Bone health. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- List three benefits of exercise. [3 marks]
- Explain how to measure pulse. [3 marks]
- Why does pulse rise during exercise? [2 marks]
- Safety rules for exercise. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Fingers on wrist [1]; count 15 seconds [1]; times four [1]
- Muscles need oxygen [1]; heart pumps faster [1]
- Warm up or water [1]; stop if unwell [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is exercise?
- What is pulse?
- What is a warm-up?
- How long daily?
- Name an exercise.
- Why does pulse rise?
- Why warm up?
- Why drink water?
- Measure pulse.
- Compare before and after.
Homework
Do a short walk with an adult and compare your pulse before and after.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is exercise? | Active work. | 1 |
| 2. What is pulse? | Heart beat. | 1 |
| 3. What is a warm-up? | Prepare the body. | 1 |
| 4. How long daily? | About an hour. | 1 |
| 5. Name an exercise. | Running. | 1 |
| 6. Why does pulse rise? | More oxygen needed. | 1 |
| 7. Why warm up? | Prevent injury. | 1 |
| 8. Why drink water? | Replace fluid. | 1 |
| 9. Measure pulse. | Number. | 1 |
| 10. Compare before and after. | Table. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Active work.; 2 Heart beat.; 3 Prepare the body.; 4 About an hour.; 5 Running.. Level 2: 1 More oxygen needed.; 2 Prevent injury.; 3 Replace fluid.. Level 3: 1 Number.; 2 Table.; 3 Plan..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Explain benefits of exercise | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Measure pulse safely | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Describe changes in breathing | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Plan a safe routine | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Exercise only builds muscles.” Also heart and lungs.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain exercise benefits and measure pulse.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns how exercise affects the body. You do not need to be an expert to help.
- Exercise together.
- Ask “How did your heart change?”
- Drink water.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: explain benefits of exercise; measure pulse safely; describe changes in breathing; plan a safe routine.
Prerequisite knowledge. Grade 3 body ideas: major organs, the heart and lungs, nutrition and healthy habits.
Materials. Watch with seconds, notebooks. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Clear a safe area.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Ask a learner to jog on the spot and ask, “What changed?”
Explanation (10 min). Teach exercise and pulse.
Guided activity (10 min). Learners measure.
Independent activity (10 min). Learners compare.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Pulse rise? Breathing rise? Safe?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Exercise only builds muscles.” Also heart and lungs.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain exercise benefits and measure pulse. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 4 Unit 3, topic 8; Next Generation Science Standards, structure, function and information processing; Cambridge Primary Science Stage 4, biology; IB Primary Years Programme, who we are. These sources informed the lesson.