2.48 describe experiments to investigate the effect of exercise on breathing in humans

Method
- Sit as still as possible for 5 minutes
- Time 1 minute and count the number of breaths you take
- Do 5 minutes of exercise
- Immediately after, time 1 minute and count the number of breaths you take
- Repeat experiment 3 times to ensure an accurate result (and remove any anomalies).

Conclusion
If all goes well, your results should show that exercise increases heart rate (increased breaths = increased heart rate)

NOTE: during the experiment you will need to control all things that could affect your results. E.g level of exercise, time spent exercising, temperature in room/test area, size of person etc