Clickbait, but you're welcome, because post activation potentiation is legit and based in dozens of studies.
Basically, post activation potentiation means after using a heavy (ass) weight, your nervous system-both central and peripheral-are stimulated and ready to go. In even simpler terms, post activation potentiation is after using a heavy weight, a lighter weight seems even lighter.
I like to use post activation potentiation in the following way most of the time. If I am doing working sets in the 10+ rep range (80% or under 1 RM) then I will overshoot that and do 1-5 sets of 1-3 reps with 85-95% 1RM. I don't recommend going to failure. I don't recommend more than 3 reps. Most of the time I'd do just 1-3 sets, not 5.
So, if you have 4x10 at 70%, just hit a heavy single, double or triple at ~20% over that working weight. It shouldn't take much out of you, but the post activation potentiation effect can certainly improve performance. You can also try the more complex versions, a few are listed here:
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All in all this is a great way to spur additional gains in performance and maybe muscle as well, just don't get too carried away with the top sets, and maintain good form. When in doubt, lower the weight slightly.
Further Reading (both excellent articles with the references for any claims in the video).
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