Third, once your grip is set, don’t let it move as you get under the bar, and definitely don’t let it move once you’re in position under the bar. Your grip plays a pivotal role in your ability to center yourself relative to the bar, so make sure your grip is a constant.
Fourth, we typically teach a “thumbs on top” grip with relatively neutral wrists – this ensures that the bar is never supported by the hands and wrists. However, if you don’t have the shoulder flexibility to achieve this position, and this is not uncommon, you can bend your wrist backward into extension and wrap your thumbs under the bar and still utilize the low bar position. This is very common, it can work quite well, and if you use this grip, I would recommend wearing wrist wraps to provide the wrists with extra support.