isolation exercises Archives

Study: Pounds of Muscle After One Workout (Yes, One Workout)

Q: In the “X Factor” interview at X-Rep.com, Jonathan says you guys tried a static contraction at the end of isolation exercises with only mediocre size results. But I just got the X-Rep Update #1 e-book, and you’re recommending them. Why have you found static holds more effective now than in the past?

A: When we first used static contraction many years ago, we did them on contracted-position exercises, like leg extensions, holding the flexed position for as long as we could after full-range exhaustion. That’s a hold after a number of regular reps. We got good gains, but later that hold at the end of a set evolved to X Reps on the big midrange exercises instead of isolation moves, and that worked much better at building bigger, fuller muscles.

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Pec Contraction Without Machines or Cables

Q: You have cable crossovers, cable flyes, or pec deck flyes listed as contracted-position exercises for chest in 3D Muscle Building. I train in a home gym without a cable set up. What should I do for pec contraction?

A: Contracted-position exercises are usually isolation exercises that keep the target muscle under tension throughout the set. In other words, there is no bone-support at lockout so the target muscle gets no rest till the end of the set… [Read more…]

Muscle Expansion With Isolation

Q: Isn’t it true that you activate the most muscle fibers in the flexed position, like at the top of a leg extension or leg curl? I know that [Nautilus creator] Arthur Jones said that. So shouldn’t I really flex at the top of those isolation-type exercises? Come to think of it, why should I do compound exercises [like squats] at all? Isolating the muscle appears to be the logical way to stimulate the muscle growth best.

A: We respect the late Arthur Jones and value much of his research, theories, and opinions (Steve met him many years ago in Florida); however, newer research states the contrary—that the contracted, or flexed, position of an exercise is not where the most force/fiber activation occurs—it’s the bottom, where the target muscle is somewhat stretched. Here’s a quote from respected scientists Steven J. Fleck, Ph.D., and William J. Kraemer, Ph.D., that makes the point (we’ll put their statements in simpler terms in a moment): [Read more…]