going too far back will make your pelvis posteriorly tilt which can cause injury to your spine (lumbar?) under heavy loads.
best thing to do is scratch the leg press and start squatting, but if you are intent on leg pressing have someone watch you and see where your pelvis starts tilting, you need to stop the movement right before that starts happening. for an increased ROM you can make your hamstrings more flexible that way you can bring you knees further back without your pelvis going into a posterior tilt.



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