What speech characteristic is associated with light intensity physical activity?

The speech characteristic associated with light intensity physical activity is that a person can sing. During light intensity activities, individuals typically experience a level of exertion that allows them to maintain more than just conversational speech; they can sing, which indicates their breathing and cardiovascular response is still at a manageable level. This level of activity does not significantly compromise their ability to engage in prolonged speech, such as singing, and reflects a comfortable zone of exertion where respiration is not overly taxed.

In contrast, options that suggest talking in sentences or shouting indicate moderate to high levels of exertion. At these levels, speaking more than a few words or engaging in complex sentences becomes challenging due to increased respiratory demand. Similarly, speaking very briefly could suggest a more strenuous activity where breath control is compromised, leading to a scenario where the individual might struggle to speak comfortably. Thus, the ability to sing remains an indicator of light intensity physical activity, as it aligns with the physiological responses expected during such an activity level.