I ran a condensed version of this for the past two months. I have lifted bench, squat and dead (or variations thereof) and doing 6 sets of 3 with 1 minute between sets. Using bench as an example I couldn't get more than 3 sets of 3 @ 122.5kgs and failed the 3rd rep on set 4. The next week I benched 145kgs for a relatively easy single. High bar back squats I failed to get the volume in at 145kgs, again on the fourth set but got 180kgs for a hard but max single. By dropping the rest periods you get to strain without heavy weight and you will get stronger as well as improving your work capacity.
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