To maximise the efficiency of a resistance workout it helps to put a really high degree of effort into a smaller number of sets. This means reaching a point where you can no longer complete another repetition with good form otherwise known as momentary-muscular-failure. However, to do this sustainably without getting injured you need to be able to fail safely.
Reaching momentary-muscular-failure with a heavy barbell on your back or over your chest… not a good idea.
Reaching momentary-muscular-failure with a low-skill bodyweight exercise such as a push up or pull up… a much safer proposition.
For long-term success with your resistance training make sure your exercises are fit for purpose.