Q: X Reps are totally intense. They give my workouts a whole new feel. Muscle burn to the max. I love it. Can I use them on more than one set per exercise?

A: The “whole new feel” you refer to is the muscle continuing to fire after the nervous system halts full-range movement. That’s what makes X Reps such a powerful muscle-building tool. It’s ultimate intensity and overload. Plus, that muscle burn is one of the best ways to get surges in growth hormone.

In a study published in the Canadian Journal of Applied Physiology (22:244-255; 1997), researchers showed that there’s a direct correlation between higher blood lactic acid levels and GH release from the pituitary gland. That means the more muscle burn you can induce, the more growth hormone you can stimulate—up to a point. And growth hormone does everything from help you build muscle and burn fat to bolster your immune system and strengthen bones, ligaments and tendons. Talk about bodybuilding bonus points!

Because X Reps are so intense, most trainees will get best results by doing one straight set to failure followed by another straight set to failure with X Reps. The first straight set to failure is more of an extension of the warmup. A warm muscle can contract up to 20 percent better than a cold one, so having the muscle primed for your X Rep set is very important. (Most bodybuilders don’t warm up sufficiently, which can significantly limit progress.) The first heavy set to failure extends the warmup sets you do prior to your first work set, and it also pumps up nervous system reaction time so your X set is X-ponentially more effective.

If you have an above-average recovery ability, you may benefit from doing both sets with X Reps; however, if you try it and start feeling lathargic and lose your enthusiasm for training, back off. That’s overtraining trying to step in and stomp on your progress. Don’t let that happen. We recently tried doing a straight set, and then two X-Rep sets, but we felt too drained and backed off to one. The bright side is shorter workouts and better results. X Reps work, but you can’t abuse them.

Bodybuilding bonus: While X Reps force more muscle-fiber activation, they also can trigger growth hormone surges via muscle burn. GH does everything from help you build muscle and burn fat to bolster your immune system and strengthen bones, ligaments and tendons.

Q: I have a question about the AB bench: Is it worth buying? Do you guys actually use it in your training, and has it made a difference in your development? I'm thinking about buying one but don’t want to throw money away.

A: We use the Ab Bench at every ab workout. In fact, we couldn’t train abs as efficiently as we do without it. It’s made a big difference, especially considering you can do X Reps near the stretch position, at the end of full-range ab work (the rounded back pad allows you to go from full stretch to complete contraction; see the photo). You can’t do that with standard crunches and even many of the big ab machines make it difficult. Good full-range ab work is hard to come by, even in big commercial gyms.

Not to sound like a commercial, but you can also do forward-lean laterals on it, and incline work, like presses and curls. It’s very comfortable because the rounded back pad is more ergonomic than a flat bench. That’s what makes the full-range crunches almost a pleasure to do—until you get to those last burning X Reps! Once you try it and feel how complete the movement is for hitting your abs, you’ll never go back to standard crunches.

The rounded back pad on the Ab Bench makes complete full-range ab work possible, and once you hit failure you can do X Reps near the stretch position to really etch in those six-pack delineations. For more information, visit http://store.yahoo.com/homegym/homeabbench.html.

Q: The fast-twitch fibers are best worked in a four-to-six-rep range, so why not just do X Reps in that rep range? The time under tension for the above, assuming a three-seconds-up/one-second-down cadence, equals about 16 seconds plus four X Reps. That’s a total time under tension of 26 seconds. Won’t lower reps and heavier weights produce more growth?

A: Heavier weights and lower reps will produce more growth—in a couple of fast-twitch fiber types. Scientists believe there are at least five (some even say nine) different fast-twitch fiber types, some being slightly more endurance oriented than others. So a set with four to six reps plus X Reps may do great things for one or two of those; but to get at the others you’d want to include slightly higher-rep sets (or include drop sets and supersets in combination with X Reps, as outlined in The Ultimate Mass Workout e-book). That will help you hit as many fast-twitch types as possible.

Technically speaking, fiber makeup dictates which rep range should dominate for an individual. For example, if you have more pure fast-twitch fibers, lower reps should dominate in your routine, but you shouldn’t neglect other rep ranges because you want to hit as many fiber types as possible to max out growth. In other words, the more fibers you get to grow, the bigger your muscles will be.

In our cases, Jonathan, being more mesomorphic (muscular/athletic), responds to lower reps, but he also includes drop sets and supersets to hit a variety of fiber types as well (those techniques bring in an endurance component). Steve, on the other hand, responds better to higher reps, as he’s an ectomorph (hardgainer/skinny) with more endurance-oriented fast-twitch fibers as well as lots of slow-twitch fibers. Heavy straight sets don’t do much for him, so he relies more on drop sets and supersets, while still keeping the reps in the six-to-12 range. That means if he does a drop set of 8(6) reps—eight reps, reduce the weight and immediately do six reps—he’s doing 14 reps. That’s two lower-rep sets back to back, giving him the best of both worlds. Add X Reps to one of those sets and he gets even more time under tension, overloading a number of fiber types. It’s a very efficient way to train for more muscle mass.

Remember, it’s not about just hitting fast-twitch fibers with low reps. There are a number of different fast-twitch fibers that vary in work capacity. We attack that problem by doing heavy work but also getting more endurance-oriented anaerobic work by using supersets and drop sets along with X Reps.

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