I recently took a long time off from doing deadlifts due to an injury, now I'm easing back into it and paying close attention to my form. I realized that the only way I can reach the bar when it's on the ground is by slightly rounding my lower back. I'm not sure if I've always had this problem and never realized it or if this is a new problem that's developed due to a lack of flexibility caused by the time off.
It mainly just feels like my abdomen can't possibly get any closer to my thighs (ie I can't make my hip angle any smaller), so in order to get my arms lower I have to round my back. This seems like an obvious fix which would be to work on my flexibility but I'm not sure what exactly needs work. Hips, hamstrings, lower back, all of the above? Maybe I just don't know what a proper starting position should be like. Any advice?