Okay, class, please open to this web page and begin studying:
Okay, class, now what did Bobby Pandour refuse to train with?
That's right, he didn't train with heavy weights. He used only light dumbbell's and he was constantly tensing and flexing his muscles. By modern standards, this is an impossibility. A build like this isn't supposed to be possible without heavy weight training and, ah-HEM, supplementation. Still, Bobby Pandour did it. The pictures are there for anyone to see.
Still, the question is, HOW????
The answer can be found in the writings of the great strongman George Jowett. According to Jowett in his book, "Unrevealed Secrets of Man", the weight was never supposed to be the source of the tension upon the muscles. It is merely supposed to be a tool to focus your CONCENTRATION upon the muscle. If anything, the development of the muscle was coming from the mental concentration upon powerfully flexing the muscle.
That's where so many get it wrong when they're exercising. To exercise without complete mental concentration upon the movement that you're doing will not get the results that you would get if you were devoting all of your mental powers to your workout. Take the ubiquitous pushup: We've all met that guy who said he could do 100 pushups. Then, when he drops down, he's not putting any real effort into them. He's letting his weight drop on the down movement rather than controlling it on the way down. He lets his back go crooked or has his ass in the air. He's not putting any mental focus into his movements and as a result he gets no benefit from them.
That lack of mental concentration is where so many miss out on when they're exercising. Sandow mused about why the more thought he puts into his muscles, the bigger that they get? Modern Science is beginning to realize that when the mind is thinking about a muscle in particular, it sends extra nerve signals to it. These stimuli actually make the muscle grow quicker than if there was no thought of the muscle being worked.
So, when you're working out, be conscious of which muscles are being worked. Once you have realized which muscles are doing the work, focus all of your mental energy on them. Make them work harder. This will make the difference between an effective pushup and a blowhard dumb-ass moving his arms in a pointless waste of motion. You will be doing the impossible: Making muscle without heavy weights.