That is a good question!
“Lifting to failure” is an expression that many bodybuilders use to refer to the point during a set of an exercise when they cannot successfully complete another rep of the exercise they are performing.
Many times when this phrase is used, what it actually refers to is “perceived failure”, or “stopping at the rep before failure”.
Allow me to explain…
When I’m referring to lifting to “failure” in the article, what I actually mean is lifting up until the point where you feel like you would not be able to complete another rep — you don’t have to lift until you actually fail a rep; I actually would advise against doing so unless you have someone spotting you and are an experienced lifter.
I am going to edit the “A Simple Technique to Increase Muscle Growth” article after I post this response to include a note at the bottom explaining what I mean when I’m referencing lifting to failure throughout the article because it is important to me that the information I give teaches methods that are safe.