Nobody walks like Elvis gyrated in his early days of his career. Likewise, in gait, the adductors do NOT adduct while walking. Imagine how we all would look if we constantly walked across our midline if we moved like the anatomy books describes the action of the adductors.
This extremely powerful muscle group has an angulation to them from the posterior femur angling forward and upward to the pubis ramus of the ischium. By their orientation, they have a hug impact upon rotation of the femur. Let us imagine we are viewing the gait cycle from beneath a glass floor. As the left leg moves forward and the left foot hits the ground, the left adductor group is lengthening to assist the deceleration of hip flexion and external rotation of the leg. As the foot then becomes firmly planted upon the ground and the leg rotates inward, the adductor helps to slow down the internal rotation of the hip and femur.
On the opposite side, just prior to heel off, the adductor group assists to decelerate hip extension and external rotation of the femur. As the foot begins to invert, which will cause the lower extremity to rotate outward (external rotation), the right adductor group assists to slow external rotation of the leg. The cycle then repeats when the right foot hits the ground, but the roles of each respective adductor group reverses. Wow, a lot different than the book says!
Try doing long stride lunges on an anterolateral angle, i.e. 10-20 degrees to the right or left to effectively work the adductors. Also, give an asymmetrical squat a try and see how the adductors react! Good luck!