Basically, the concept of HIT (high intensity training) is that it is not only more efficient but OPTIMAL to only do one set of an exercise , all the way to momentary muscular failure. This is the antithesis of the high volume “pump” training popularized by Arnold. The concept was invented by Arthur Jones, and further popularized by famous bodybuilders Mike Mentzer and Dorian Yates. The mike mentzer tapes I mentioned in my OP are a great resource on this topic, as well as Arthur Jones original books “natilus bullitin 1 and 2”.but what do you mean by ''brief session till failiure" ?