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Here's a great demonstration of why isometric contractions have the muscle-building power that they do. And, it also shows why you can train in just the strongest range of motion and get great results...
Take your right hand and grab your right knee, as if it were a big jar lid that you were about to twist open. Now, squeeze as hard as you can. While you're squeezing, use your left hand to feel your right forearm. It's straining under the effort, sure, but you'll notice that not all of the muscles are fully engaged, and many of the ones that are still have some "slack" in them. Okay, now let go of your knee and make a fist with your right hand, as tight as you can. Feel that right forearm again. Notice the difference? EVERY muscle is fully engaged. And while I bet you could have grabbed your knee for quite a while, you're probably already getting exhausted from making that fist. That's because the highly-responsive Type IIB fast twitch muscle fibers, the ones most responsive to growth stimulus, can only contract for 5-10 seconds. We want to work those as hard as we can, as fast as we can. And that's what the 1-Rep gym does. Also, back to that knee-grabbing... clearly, you're not as strong in that position. If you were using some forearm training, though, you wouldn't be able to use a weight that was greater than you could handle in that weaker part of your range of motion. That's why most workout recommendations involve multiple reps and sets # because with a lighter weight, you need to wear out your body before you can fully stimulate it to grow. And that's why the 1-Rep Gym can produce such amazing results in such a short amount of time. Maximum growth-stimulating work in the shortest possible time thanks to the most advanced isometric gym ever created.
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