Muscle failure is a condition in which a person cannot complete a repetition with a given weight and in full amplitude. It occurs as a result of central or peripheral fatigue.
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Untrained beginner’s muscles get the necessary stimulus for growth somewhere around 3-5 reps before failure. After that there is a plateau and more stimulus does not increase hypertrophy.
Training to failure, you just waste energy, fatigue the nervous system and increase the risk of injury, which is especially true for beginners unfamiliar with the correct technique.
But it makes sense for trained athletes to perform approaches “at point-blank range of motion”. This technique forces trained muscles to activate more fibers and provides faster strength gains.