Good conversation going on here. In my opinion taking your training to failure on a particular sets during the correct training periods is a very neccessary and feasable way to stimulate muscle growth when used under cetain circumstances. In a body building forum, failure techniques are best utilized within a periodization scheme, on rotation, as the one described by our moderator in a previous posting on this bulletin board. Continuously using HIT (High Intensity Techniques) like failure sets can lead to over training and eventually injury as well as decrease the central nervous system response which ultimately is the vehicle by which strength , thus muscle is gained. It is also misunderstood by many that "failure" by definition means the inability to move a particular weight any longer. However, correct failure is best defined by a loss of good lifting form. Following this simple rule can save a you a world of hurt in injury time later in your training years.
Keep training safe and hard!
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