heavy, light, medium
The Heavy, Light and Medium System
by Bill Starr
One of the basic principles of strength training is the heavy, light and medium system. Like all the other concepts used int this physical science, it's not a new development. The old-time strongmen incorporated into their routines the idea of doing a less-than-strenuous workout after a difficult one, but it wasn't actually pout into a definite usable system until the mid 1930's, when Mark Berry wrote about it in his book Physical Training Simplified. From that point on aware strength athletes not only used the heavy, light and medium system, but they also understood why it was so beneficial.