Lung Capacity: Method

The Dependent Variable:
Lung Capacity into a balloon before and after a work-out, 3 second blow
The Controlled Variable(s): 
Balloon, 3 second blow
The Independent Variable:
Nothing
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1. Grab the equipment needed, 2 Balloons and Tape Ruler
2. Blow a balloon for 3 seconds
3. Measure the diameter in centimetres and record it using the Tape Ruler
4. Graph the result
5. Complete a 30 minute work-out at full potential
6. Blow the second balloon for 3 seconds
7. Measure the diameter in centimetres and record it using the Tape Ruler
8. Graph the result
7. Repeat for reliability