Hello from France,
for the HIAH programs, you need to choose the weight in the fisrt set : a weight you can lift for 4-6 reps (for example) and keep this weight for all sets.
My question is :
is it 4-6 reps until total failure or "technical" failure ?
I know that Waterbury advocate "technical failure" for the sets, but does not explain for the fisrt one (wich determine the load)