Interesting post, Maybe one set isn′t enough to exhaust all motor units but i′m sure it′s not a huge difference either way, but it could be correct.
One set works thats for sure, when it comes to strength one set is most certainly enough (optimal?), we do get hypertrophy from one set too but I think training should be switched up from time to time and temporarily do multiple sets like CFT for example, which is something i′m going to experiment with soon just to keep things from going stale.
I think it could vary from person to person whether one set is optimal or not but doing ridiculous amounts of sets isn′t the answer.
On failure, i′m not sure on the decrease in testosterone but I think Mike should of maybe been a little more flexible on this because the truth is going to failure all the time takes a massive toll on your body, it works, no doubt about it but it′s not the only way to train, I don′t think he should of made it mandatory.
I can totally see Mikes logic behind training to failure and he′s right but doing it continually is my main beef with it.
Also if one continues going to failure, workouts will continually grow further apart to a point where the body has little reason to grow any more muscle (I′m talking low frequency here). Strength gains may keep coming but it is not optimal for hypertrophy.
Going beyond failure, i′m not a fan of this. I′ve done it many times but I don′t think the extra effort is worth it. Don′t get me wrong I do believe in doing it from time time it can give your training a much needed kick but I certainly don′t think you have to keep continually raising intensity to progress.
On sets, I don′t think number of sets matter a great deal, what I do think is that if you′re going to failure you should only do one set if you′re training just shy maybe add another set or two, the extra TUT may benefit you!
To find out what is optimal for us as individuals is to experiment a little but while staying close to HIT principles. And one set DOES work! But any info on training should never be took as gospel, you could sell yourself short.