When we walk, in addition to our weight, we create a repeating pattern of forces as our mass rises and falls. This creates a vertical fluctuating force of around 250 N (55 lbs) which repeats with each step.

There is also a small sideways force caused by the sway of our mass as our legs are slightly apart. This force, of around 25 N (5.5 lbs), is directed to the left when we are on our left foot and to the right when we are on our right foot and repeats with every second step.