as long as youre not using too much weight as to hurt yourself
pushing yourself to complete the set wholeheartedly is the only way you will make progress
but you dont want to keep lifting for the sake of exhausting your muscles when you only going to be doing them halfway or awkwardly/incorrectly
starting off, its fine to stay in your comfort zone in order to warm up your possibly inactive muscles, but you should quickly move out of it
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