Before you go up, position yourself into anterior pelvic tilt and then go up, and then at the end use your glutes to get yourself into neutral position when you stand up.
If you cannot stay into anterior pelvic tilt when trying to lift the bar off the ground, then the weight is too heavy. Same thing goes with lifting the bar up from a rack as well. Whatever you do, please do not crunch your back when you try and get the bar off the ground because you will hurt your back. If you can, buy a lighter barbell or just use dumbbells like you said.
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