Taken from the Article " " Here art two you might like. The more you work out, the more you'll grow. No, no no. This is one of the most damaging myths that ever reared its ugly head. 95% of the pros will tell you that the biggest bodybuilding mistake they ever made was to over-train--and this happened even when they were taking steroids. Imagine how easy it is for the natural athlete to overtrain! When you train your muscles too often for them to heal, the end-result is zero growth and perhaps even losses. Working out every day, if you're truly using the proper amount of intensity, will lead to gross overtraining. A body part, worked properly, i.e. worked to complete, total muscular failure that recruited as many muscle fibers as physiologically possible, can take 5-10 days to heal. To take it a step further, even working a different body part in the next few days might constitute overtraining. If you truly work your quads to absolute fiber-tearing failure, doing another power workout the next day that entails heavy bench-presses or deadlifts is going to, in all probability, inhibit gains. After a serious leg workout, your whole system mobilizes to heal and recover from the blow you've dealt it. How, then, can the body be expected to heal from an equally brutal workout the next day? It can't, at least not without using some drugs to help deal with the catabolic processes going on in your body [and even they're usually not enough .] Learn to accept rest as a valuable part of your workout. You should probably spend as many days out of the gym as you do in it. The longer you work out, the better. It just isn't necessary to do 20-30 sets for a body part, or even 10 sets like many 'experts' would have you believe. In fact, research has shown that it's possible to completely fatigue a muscle in one set, provided that that set taxes a muscle completely, i.e. incorporates as many muscle fibers as possible and takes them to the point of ischemic rigour where, rather than contract and relax, the muscle fibers freeze up, sort of like a microscopic version of rigor mortis. Any further contraction causes microscopic tearing. Hypertrophy is just one adaption to this kind of stress and it's naturally the kind most bodybuilders are interested in. This kind of intensity can usually be achieved by doing drop or break-down sets where you rep out, lower the weight, and continue doing reps until you either can't do another rep or you've run out of weight. It can also be achieved by doing your maximum number of reps on a particular exercise: by a combination of will, tenacity, and short rest periods, you complete ten more reps. You achieve the short rest periods by locking out the weight-bearing joint in question without putting the weight down. In other words, completely surpass your normal pain and energy thresholds. If you can truly work your muscle to the point described, it will afford you little, if any, benefit to do another set (Westcott, 1986). The exception would be the body parts that are so big that they have distinct geographical areas, like the back, which obviously has an upper, middle and lower part. The chest might also fall into this category, as it has a distinct upper and lower part, each with different insertion points. Enjoy, you future Olympians!