By Howe Russ If you are reading any magazine which claims to teach you how to build muscle, you could be forgiven for groaning every time you turn the page to be met with an advert for a pre-workout supplement claiming to be the difference between success and failure in the gym. In today's article we are going to show you how effective, or ineffective, these products can actually be. If you are to believe the hype, which supplements want you to do of course, then you'll expect to be able to see life changing results within a week. Naturally, things don't work out that way. While the last three decades has seen countless improvements in our knowledge of fitness and nutrition, the basic rules of building a leaner, more powerful physique have remained largely untouched. There is...