well me personally, i keep the total number of reps roughly constant so if i do 1 set of 15 reps for the 15s, i'll do 2x10 for the 10s, and 3x5 for the 5s. This is keeping them roughly the same in terms of volume, while the load constantly increases, causing constant microtrauma. many people who can't handle as many sets during the 5s lower it to 1 or 2 and still get great results, but if u can handle the heavy loads with more sets, do it.
but a big factor is your training history, in your previous training, how many sets did you do per muscle group?
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you just hella confused me, i thought hst was 3x a week full body low volume....
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it's low
ER so you can train more frequently, as in, it's not the 12 sets per bodypart, 1x week frequency, but it's roughly the same volume as you had before, but spread out to keep the anabolic effects of training always elevated.
so whatever volume you had previously, you can spread that out in 3 sessions a week. an extremely important point is that HST is a set of guiding principles as to how to train for fast muscle growth, it is not a program.
i suggest you read the FAQ, and then read again, i'm up to my 5th time reading it hehe
How many sets and how to determine it
http://www.hypertrophy-specific.info/cgi-bin....;t=4628