The 411 on Back Angles and Torque When Squatting
The angle of the torso, when squatting, is not a function of whether or not the bar is high or low on the back. The angle of the torso (and thus torque on the spine) is primarily determined by the angle of the shin, a.k.a how much the ankle dorsiflexes. AND IN MY BOOK, THIS IS THE KEY TO BEST BACK TRAINING PRACTICES. GET IT??? MAKE YOUR QUADS, HAMS AND GLUTES DO THE WORK. If your shin is perpendicular to the floor, then your torso will incline forward to keep the CoM over your BoS, regardless of how low the bar is on your back. And your back will be forced to handle higher torque. A good, general rule of thumb, IMHO, is to keep the shins and the torso parallel, from an inclination standpoint. This could change with femur/torso length issues (tight adductors and hips in general can cause issues too), but this method is pretty good to help someone figure out whether or not they have decent ankle flexibility when squatting. And this will minimize torque on the back, as we will d...
Comments
Can you explain exactly how this bar was loaded incorrectly? It looks like the collars aren't snug enough against the weights or is this just crappy training plates that warp (or both)?
Alex
If you are going to repeatedly lift < 40 kg from the ground, you should use good 5 kg and 2.5 kg training plates (Hitechplates, Eleiko, Werksan) that hug the collars of the bar and support the weight of the bar when it is on the ground. Good training plates allow the bar to sit evenly on the ground for lift off. The rubber 10 lb plates/plastic 5 lb plates are not structurally sound enough to support the weight of the bar. This is is especially true of the weight is going to be repeatedly dropped or left overnight on the bar. This will eventually destroy the skinny 10 lb/5 lb plates.
Other than that, proper loading of the bar means the heaviest bumper/iron plates are always loaded first, then the lighter iron plates are added in sequential order, with the number side facing out. Weight should always be stripped from the barbell after use.