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The talk test is a simple way to measure relative intensity. As a rule of thumb, if you're doing moderate-intensity activity you can talk, but not sing, during the activity. If you're doing vigorous-intensity activity, you will not be able to say more than a few words without pausing for a breath.
Added 8/31/2012 7:38:55 AM
This answer has been confirmed as correct and helpful.
Confirmed by
sujaysen [3/2/2014 12:58:57 PM]