I started an HST cycle a few weeks ago and for the 15s and 10s things went great - I increased my maximums in both rep-ranges and even felt like I could have gone higher. I had decided to up my caloric intake quite a bit (eat like a pig) after gaining a little strength, but losing a lot of weight, on a short max-stim cycle and a longer 5x5 cycle. However, by the end of the first week of 5s I felt completely drained and every rep felt like a maximum. I was training full body (8 sets) three days a week, but at the start of the second week I just couldn't face my Monday session so I put it off until Tuesday (something I can't ever remember doing before). Well, I felt strong, the reps were less 'ragged' and at the end of the workout I wasn't winded at all. So, if the 5s are in large part to increase strength would it be acceptable, if not preferable, to drop the workouts to 2 full body days per week? I am following the standard 1x15, 2x10, 3x5 sets routine.