I think you are sitting back too much causing that pelvic tilt. Your femur is like a pendulum. It's going to move like a curve with a certain point, around 90 deg, being the farthest distance. Thus your hip has to curve back towards your knee after that point. Whereas, I think if you let your knees go forward alittle more and you squat down rather than back, you should have less pelvic tilt. Don't know if any of that made sense.
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