no one is making any bold claims on here, they are taking the piss out of you
And failing badly. 😆
By the way, they are making bold claims like this one
"Years ago I did the Arnold "Education of a Bodybuilder" routine. Lots of sets, 5 per exercise kind of thing. I went from 160 pounds at 5'9" to about 200 pounds in 4-5 years- and then it stopped. I think I literally hit my genetic natural limit. No extra sets made a difference- and I was lifting heavy. I tried all sorts of variations to no avail. So I eventually just decided to maintain what I had- and that is where HIT came in.
Doing just one set per exercise twice a week (I may add a light warmup set or two if i feel the need but just for the first exercise) I lift to maintain strength. I think that is the most you can expect from HIT. I do mostly dumbbell exercises, and I am not very strong, but doing just one set just short of failure I am happy with the results. My bodyweight has stayed in the low 200's for years now.
For the record, I currently do just one set of 8-12 reps of movements like dumbbell rows (110-120 pounds), dumbbell flat bench (80-90's), dumbbell presses (70-75's), shrugs, etc. etc. Good enough to feel strong- just nothing out of the ordinary. My workouts take 15-20 minutes.
I can see doing this routine forever- like I said it has worked perfectly for maintenance of strength and body weight."
Just thought I let you know. 😉