How exercise helps the heart and lungs — Health, 11–13 years
Why regular movement changes what your heart and lungs can do. Health, 11–13 years.
A training effect
When you move, muscles need more oxygen and energy. Your heart beats faster to send blood, and your breathing speeds up to bring in oxygen and remove carbon dioxide. With regular activity, the body becomes better at this job, so the same walk or game may feel easier.
Why people train
Humans evolved to move often, but modern life can make sitting easy for many hours. Training is a planned way to give the heart, lungs, muscles and bones useful work. The problem is not that rest is bad; it is that too little movement over time can reduce fitness and affect health.
Building a walking habit
Leo walks for 10 minutes after school on Monday and feels comfortable. He adds 5 minutes each week: 10, then 15, 20 and 25 minutes. He walks briskly enough to breathe faster but still speak in short sentences, and he stops if he has pain, feels faint or cannot recover normally.
The trap: harder is always better
It is reasonable to think that the hardest workout must produce the best result. But fitness grows through a suitable challenge followed by recovery, not through exhaustion every time. A gentle walk, a dance or a game can all count; the best activity is one you can do regularly and safely.
Beyond sport
Movement appears in cycling to school, climbing stairs, carrying shopping, gardening and dancing. These activities help your body even when nobody is keeping score. Choose different kinds when possible: some make your heart work, some strengthen muscles, and some improve balance or flexibility.
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