Actually Prince and cytixxx, NOT squatting below parellel is worse for the knees and other injury promoting things than stopping at parellel for a number of reasons:
1. First of all, by not squatting the full range of motion, you don't maintain proper lumbosacral bodymechanics. This sets you up for back pain.
2. Muscle imbalances. If you can't squat past 90 degrees of knee bend without the heels raising or the body bending excessively forward at the waist, but can squat all the way to the floor while holding onto something, you have some muscle imbalances in regard to the pelvis/lumbosacral region (iliopsoas, external hip rotators, lower back. Additionally, since the hip joint is considered the "steering mechanism for the leg" improper pelvis, hip, and lumbosacral mechanics could lead to knee and/or ankle problems.
3. Regular performance of the full squat will help you in your lumbosacral/pelvic flexibility, which may prevent injury or muscle imbalances long before they become chronic.
4. Parallel squats also may be potentially damaging to the knee joint. The original data on full squats causing ligament laxity was obtained in an uncontrolled manner. Recent attempts to replicate these studies haven't shown any increased laxity or knee pain/dysfunction from doing full squats as opposed to parallel squats.
5. When the knee joint is at 90 degrees this is actually it's most unstable position, and if you were trying to assess the integrity of the cruciate ligaments, you'd want the least amount of interference from other structures as possible. Therefore, you can imagine how much force is on the knee ligaments when you reverse the squat movement at 90 degrees-the most unstable point-reversing the momentum and accelerating in the exact opposite direction. Couple this with the fact that most, if not everyone, are capable of squatting considerably more weight to the parallel position than the full squat position, and you've set your body up for muscular imbalances...and we all know what muscle imblances lead to - injury.
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Complex problems have simple, easy to understand, wrong answers.
<FONT COLOR="#000002" SIZE="1" FACE="Verdana, Arial">[Edited 1 time by TheSupremeBeing on 07-14-2001 at 08:55 PM]</font>