Tension is some form of continous taut muscles or glands. Strain is deliberately exerting in singing. The sound of strain usually has to do with conflicting muscles in use, more than overexertion due to volume increases.
Tensed muscles are more likely to be strained because they are taut.
To reduce strain, the muscles need to work in harmony instead of conflict. This can be accomplished whether tensed or not tense; but it is far easier when not tense, as being “detensed”, the muscles have greater freedom of movement.
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