The video explains how anatomical differences, particularly the length of one's femurs, can significantly influence the way a squat is performed. It highlights that individuals with shorter femurs generally find it easier to squat deeply while maintaining an upright chest position. Conversely, those with longer femurs often struggle to maintain balance and an upright posture during squats. The video uses examples of two individuals, Bailey and Tori, to illustrate these differences. Tori, who has longer femurs, can adjust her squat form by adopting a wider stance or opening her hips more to achieve better balance and a more upright chest position. Additionally, using a heel lift, such as weightlifting shoes, can also help in maintaining an upright posture during squats.