Final answer:
The talk test is a self-assessment method used in exercise to estimate intensity levels based on breathlessness. It distinguishes between moderate and vigorous-intensity activities through speech ability.
Explanation:
The talk test is a self-assessment used during exercise to estimate the intensity of the work being performed. It is based on the degree of breathlessness observed while attempting to talk during exercise. The basic idea is that during moderate-intensity aerobic activity, a person can talk but not sing, while during vigorous-intensity activity, a person cannot say more than a few words without pausing for breath.
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