Think of it this way: When you do a set of 10 repetitions, it's the LAST REP, the one you can barely make (or where you reach "failure" and can't complete the rep) where you're engaging as many muscle fibers as possible. In fact, the 9 previous reps are kind of like a warm-up... but, actually, they often weaken the muscle, meaning you're not putting out the maximum force on that last rep that you could.

With isometric training, like you do with the 1-Rep Gym^TM, it's like doing the last rep first, plus having ALL of your strength available from the beginning.

Now, that said, we often recommend that you do a warmup set of 5-10 "reps" at about 1/2 the force you expect to put out. And since you're not moving the bar when you do these, that only takes a few seconds and doesn't tax your muscles, just gets them ready for that powerful, anabolic (muscle-building) contraction you're about to do. 

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