The truth is, there is no "right" foot position for squats. In a study published in the Journal of Strength and Conditioning Research, scientists studied different foot positions during squats and found they made no difference in the muscles activated (which include the glutes, quads, inner and outer thighs). That doesn't mean you shouldn't try different stances -- changing how you squat, whether you change your stance or the type of squat you do, can make them feel fresh and more interesting.
When positioning yourself for squats, take your feet out to a comfortable distance and keep your knees in alignment with your toes as you squat. Practice different stances and foot positions until you find what feels good to your body. Each person will have a different stance based on his height, body and goals.
Source:
Boyden, Gareth. A Comparison of Quadriceps Electromyographic Activity With the Position of the Foot During the Parallel Squat. J Strength Cond Res 2000 Nov; 14(4): 379–382.


