Well, there are dozens of ways to "shock" your muscles, and giving them an occassional "jolt" can be a good thing. However, the newer you are to lifting, the less often a shock will be needed. What is most important for newer lifters is constant PROGRESSION. This simply means you must constantly strive to lift heavier weights or increase reps with the same weight.
That said, your muscles can be quite adaptive (as can your mind and nervous system), and after a while doing the same exercises for the same rep range (even if getting stronger) will result in stagnation. So, every few weeks there is nothing wrong with "breaking your pattern," and employing higher reps for a week or two. 8-12 reps actually produces more gains in size than 6-8 does for many people, so give it a shot. Try some new exercises as well...or change the order, or your rep speed.
This will give your mind and body a new stimulus, and when you return to your normal program you will do so with more enthusiasm and perhaps some new gains in size.




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