Which statement describes grade 3 in manual muscle testing?

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Grade 3 on manual muscle testing means the person can actively move the tested muscle through its full range against gravity, but with no external resistance applied. This shows they have enough strength to overcome the pull of gravity but not enough to hold or resist additional force. If movement is possible only with gravity eliminated, that would be a lower grade, and if the movement could be maintained or resisted with added force, the grade would be higher. So the statement describing active movement against gravity with no added resistance best matches grade 3.