Movement baselines, or the minimum movements necessary for human function and performance, are essential to efficiency and resiliency. The inability to perform basic movements set us up for failure down the road as I believe it lowers the ceiling on performance and movement efficiency. You can buffer large loads and high reps with poor movement for a while, sometimes even a long while, right up until you can't. Taking some time to work on these basic movements can improve system adaptability and ultimately improve performance.
A good starting stance is individual depending on each person's motor control and anatomical alignment.
Bottomline: Take 5 minutes to work on this movement pre-workout (just add it into your warm-up). Many will be surprised at how much of a struggle it is to maintain a neutral spine while flexing at the hips and maintaining vertical shins. Try it prior to a pulling or squat pattern and see if movement quality improves and pain resolves.