I just read about this the other day. I always thought working abs before a leg workout would be a bad idea but this guy thought differently. What are your thoughts?
Myth #5: You Shouldn't Train Abs Before Legs
Didn’t know this one was a myth? Good! However, let’s discuss it anyway since I think this is an erroneous piece of fiction that my soon gain mythical status within the circle of infallibility known as the accredited personal training associations.
Credit Strength Coach Ian King for being the first one to really shed light on this one being a fallacy. At first glance, the theory holds water; if your abdominals are fatigued then they won't be able to stabilize the body or the spine, therefore leaving yourself open to possible injury, or at the very least weakness, during leg training.
But incorrectly assuming that the abs are one unit is the governing body behind this misnomer. The core of the body can be divided into two distinct groups of musculature; the outer unit, and the inner unit. The outer unit is made up of what you can see in the mirror, i.e. the rectus abdominus, external obliques, and spinal erectors. Traditional abdominal exercises such as curl-ups, knee raises etc. target the outer unit musculature almost exclusively.
The inner unit is made up of the transversus abdominus, the multifidus, the diaphragm, and the pelvic floor muscles. Spinal stabilization is provided almost entirely by the inner unit musculature, therefore any ab exercises done before a leg workout will cause no significant impairment of form or function. One should, however, avoid excessive inner unit work to the point of fatigue before a workout for said reasons. Inner unit work would include any woodchop type exercise, forward or transverse ball-rolls, or most stability drills, etc.
I'm sure some of you out there are saying "...but when I do abs before legs, I feel weaker, so now what do you have to say, you pickle kisser"? This very well could be the case, but that is due to your nervous system’s inability to preferentially activate your inner unit musculature during stabilization needs, and an over-reliance on using the outer unit muscles to perform this function. This is a problem that needs to be addressed!
Referred to as "Sensory-Motor-Amnesia" (Chek, P. 1998, Scientific Core Conditioning. Correspondence Course. Paul Chek Seminars), this dysfunctional inner unit can come from heightened tension due to hypertonic muscles, from an overreliance on external apparatus (see myth #3), or from a series of musclular imbalances that can be determined through postural analysis and other soft tissue testing.
In other words, get your core in order, dude! Learn to activate your inner unit musculature with control drills and exercises designed to hit those deep muscles. Then, when training outer unit musculature, you won’t be fatiguing your inner unit. In addition, you wont impair the function of the inner unit for stabilization purposes. Whether you choose to do abs before squatting or not, it’s important to recognize how the abdominal muscles are arranged and how to use the arrangement to your training advantage.
The rest of the article is here....
http://www.johnberardi.com/updates/jan312003/na_myths.htm