
Originally Posted by
barbndr
When I was younger I had the same problem. About halfway through my squat workouts my low back would tighten up first and then gradually become worse. For me, it was a form issue. As I neared parallel, I would begin to flex my trunk. As I went just below parallel I was in a good morning/full squat position, causing me to overwork the erector muscles of my back. To fix my problem, I did alot of form work to try and maintain an upright position and incorporated some front squats and high bar squats to "get the groove" more upright. Finally added a reverse hyper to the gym at home and after about a year my problem was gone.
People always want to point to a weakness in strength (either in the abs, low back or hams) however we sometimes overlook the simple changes we can make in form (foot position, bar position etc...)
When you added low back work in, all you were doing was overtraining those muscles and perpetuating the problem. If you feel you have adequate abdominal and low back strength, I would look to your form to see the degree of trunk flexion you have at the bottom of your squat. Correct that first.
I generally don't use a belt until I go up above 500lbs, then I use a lever belt. No better belt IMO.
Also, I don't know what you do for stretching, but my warmups on leg day include at least 15 minutes of leg and trunk stretching exercises. As I get older I find I need to rely more on preparation.