Q: I gave the 4X method a try, and it feels amazing. Definitely a big pump. I’m just worried that since only the fourth set is to all-out failure that I’m not getting enough intensity to stimulate growth. I’m used to doing two to four sets on each exercise to total exhaustion. Will my muscles regress on 4X?

A: In The 4X Mass Workout e-book we explain the all-or-none principle of fiber activation. What that means is that a muscle fiber fires at 100 percent or not at all. So even on SUBFAILURE sets, you’re getting bundles of fast-twitch fibers to fire completely. [Read more…]