Walk a 200 feet (city block) and count your respirations.
How many breaths did you take?
Now try using a breathing method of your choice and compare your respiration count. Keep track with pencil slashes on a pad.
Keep in mind the longer distance you travel (5 blocks for instance) the more accurate your results will be.
This test is to show how much air volume is consumed, along with distance travelled.
Note: SCBA use is not necessary for this test.