Moderate-intensity physical activities will cause adults to sweat a little and to breathe harder. On a scale of 0 to 10 (with 10 being an absolute maximum effort and 0 being completely at rest), moderate activities are about a 5 or 6. While doing moderate-intensity activity adults should still be able to talk, but not sing along to their favourite song.
Vigorous-intensity physical activities will cause older adults to sweat and be out of breath. On a scale of 0 to 10 (with 10 being an absolute maximum effort and 0 being completely at rest), vigorous activities are about a 7 or 8. While doing vigorous activity teens shouldn’t be able to say more than a few words without pausing for a breath. Older adults should do as much vigorous activity as they can.